js字符串（String扩展）

时间：2019-06-26 17:44:23 阅读：89 评论：0 收藏：0 [点我收藏+]

var Namespace = new Object();

Namespace.register = function(path) {
var arr = path.split(".");
var ns = "";
for ( var i = 0; i < arr.length; i++) {
if (i > 0)
ns += ".";
ns += arr[i];
eval("if(typeof(" + ns + ") == ‘undefined‘) " + ns + " = new Object();");
}
};

jQuery.extend({
/**
* 根据名称全选或反选复选框。
*
* @param name
* @param checked
*/
checkAll : function(name, checked) {

$("input[name=‘" + name + "‘]").attr("checked", checked);
},
/**
* 根据复选框的名称获取选中值，使用逗号分隔。
*
* @param name
* @returns {String}
*/
getChkValue : function(name) {
var str = "";
$(‘input[type="checkbox"][name=‘ + name + ‘]‘).each(function() {
if ($(this).attr(‘checked‘)) {
str += $(this).val() + ",";
}
});
if (str != "")
str = str.substring(0, str.length - 1);
return str;
},
/**
* 根据名称获取下拉框的列表的值，使用逗号分隔。
*
* @param name
* @returns {String}
*/
getSelectValue : function(name) {
var str = "";
$(‘select[name=‘ + name + ‘] option‘).each(function() {
str += $(this).val() + ",";
});
if (str != "")
str = str.substring(0, str.length - 1);
return str;
},
copyToClipboard : function(txt) {
if (window.clipboardData) {
window.clipboardData.clearData();
window.clipboardData.setData("Text", txt);
return true;
} else if (navigator.userAgent.indexOf("Opera") != -1) {
window.location = txt;
return false;
} else if (window.netscape) {
try {
netscape.security.PrivilegeManager
.enablePrivilege("UniversalXPConnect");
} catch (e) {
alert($lang.tip.msg,$lang_js.util.copyToClipboard.netscape);
return false;
}
var clip = Components.classes[‘@mozilla.org/widget/clipboard;1‘]
.createInstance(Components.interfaces.nsIClipboard);
if (!clip)
return false;
var trans = Components.classes[‘@mozilla.org/widget/transferable;1‘]
.createInstance(Components.interfaces.nsITransferable);
if (!trans)
return false;
trans.addDataFlavor(‘text/unicode‘);

},
/**
* 根据xmlnode序列化xml
*
* @param node
* xmldom节点。
* @returns
*/
getChildXmlByNode : function(node) {
var sb = new StringBuffer();
jQuery.getChildXml(node, sb);
return sb.toString();
},
/**
* 根据xml节点，返回该节点的xml属性。返回值通过参数ary获取。用法： var node; var ary=new
* Array(); $.getAttrXml(node,ary);
*
* @param node
* @param ary
*/
getAttrXml : function(node, ary) {
var nodes = node.childNodes;
var len = nodes.length;
for ( var i = 0; i < len; i++) {
var childNode = nodes[i];
if (childNode.nodeType != 1)
continue;

var attrs = childNode.attributes;
var obj = new Object();
for ( var k = 0; k < attrs.length; k++) {
var attr = attrs[k];
obj[attr.name] = attr.value;
}
ary.push(obj);
$.getAttrXml(childNode, ary);
}
},

/**
* <img src="img/logo.png" onload="$.fixPNG(this);"/>
* 解决图片在ie中背景透明的问题。
*
* @param imgObj
*/
fixPNG : function(imgObj) {
var arVersion = navigator.appVersion.split("MSIE");
var version = parseFloat(arVersion[1]);
if ((version >= 5.5) && (version < 7)
&& (document.body.filters)) {
var imgID = (imgObj.id) ? "id=‘" + imgObj.id + "‘ " : "";
var imgClass = (imgObj.className) ? "class=‘"
+ imgObj.className + "‘ " : "";
var imgTitle = (imgObj.title) ? "title=‘" + imgObj.title
+ "‘ " : "title=‘" + imgObj.alt + "‘ ";
var imgStyle = "display:inline-block;"
+ imgObj.style.cssText;
var strNewHTML = "<span "
+ imgID
+ imgClass
+ imgTitle
+ " style=\""
+ "width:"
+ imgObj.width
+ "px; height:"
+ imgObj.height
+ "px;"
+ imgStyle
+ ";"
+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
+ "(src=\‘" + imgObj.src
+ "\‘, sizingMethod=‘scale‘);\"></span>";
imgObj.outerHTML = strNewHTML;
}
},
/**
* 获取当前路径中指定键的参数值。
*
* @param key
* @returns
*/
getParameter : function(key) {
var parameters = unescape(window.location.search.substr(1))
.split("&");
for ( var i = 0; i < parameters.length; i++) {
var paramCell = parameters[i].split("=");
if (paramCell.length == 2
&& paramCell[0].toUpperCase() == key.toUpperCase()) {
return paramCell[1];
}
}
return new String();
},
/**
* 根据年份和月份获取某个月的天数。
*
* @param year
* @param month
* @returns
*/
getMonthDays : function(year, month) {
if (month < 0 || month > 11) {
return 30;
}
var arrMon = new Array(12);
arrMon[0] = 31;
if (year % 4 == 0) {
arrMon[1] = 29;
} else {
arrMon[1] = 28;
}
arrMon[2] = 31;
arrMon[3] = 30;
arrMon[4] = 31;
arrMon[5] = 30;
arrMon[6] = 31;
arrMon[7] = 31;
arrMon[8] = 30;
arrMon[9] = 31;
arrMon[10] = 30;
arrMon[11] = 31;
return arrMon[month];
},
/**
* 计算日期为当年的第几周
*
* @param year
* @param month
* @param day
* @returns
*/
weekOfYear : function(year, month, day) {
// year 年
// month 月
// day 日
// 每周从周日开始
var date1 = new Date(year, 0, 1);
var date2 = new Date(year, month - 1, day, 1);
var dayMS = 24 * 60 * 60 * 1000;
var firstDay = (7 - date1.getDay()) * dayMS;
var weekMS = 7 * dayMS;
date1 = date1.getTime();
date2 = date2.getTime();
return Math.ceil((date2 - date1 - firstDay) / weekMS) + 1;
},
/**
* 添加书签
*
* @param title
* @param url
* @returns {Boolean}
*/
addBookmark : function(title, url) {
if (window.sidebar) {
window.sidebar.addPanel(title, url, "");
} else if (document.all) {
window.external.AddFavorite(url, title);
} else if (window.opera && window.print) {
return true;
}
},

/**
* 设置cookie
*
* @param name
* @param value
*/
setCookie : function(name, value) {
var expdate = new Date();
var argv = arguments;
var argc = arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
if (expires != null)
expdate.setTime(expdate.getTime() + (expires * 1000));

document.cookie = name
+ "="
+ escape(value)
+ ((expires == null) ? "" : ("; expires=" + expdate
.toGMTString()))
+ ((path == null) ? "" : ("; path=" + path))
+ ((domain == null) ? "" : ("; domain=" + domain))
+ ((secure == true) ? "; secure" : "");

},
/**
* 删除cookie
*
* @param name
*/
delCookie : function(name) {
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval = $.getCookie(name);
document.cookie = name + "=" + cval + "; expires="
+ exp.toGMTString();

},
/**
* 读取cookie
*
* @param name
* @returns
*/
getCookie : function(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return $.getCookieVal(j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0)
break;
}
return null;

},
getCookieVal : function(offset)

{
var endstr = document.cookie.indexOf(";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
},
/**
* 通过js设置表单的值。
*
* @param data
*/
setFormByJson : function(data) {
var json = data;
if (typeof (data) == "string") {
json = jQuery.parseJSON(data);
}

for ( var p in json) {

parts = currencyDigits.split(".");
if (parts.length > 1) {
integral = parts[0];
decimal = parts[1];

decimal = decimal.substr(0, 2);
}
else {
integral = parts[0];
decimal = "";
}

digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);
radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
decimals = new Array(CN_TEN_CENT, CN_CENT);

outputCharacters = "";

if (Number(integral) > 0) {
zeroCount = 0;
for (i = 0; i < integral.length; i++) {
p = integral.length - i - 1;
d = integral.substr(i, 1);
quotient = p / 4;
modulus = p % 4;
if (d == "0") {
zeroCount++;
}
else {
if (zeroCount > 0) {
outputCharacters += digits[0];
}
zeroCount = 0;
outputCharacters += digits[Number(d)] + radices[modulus];
}
if (modulus == 0 && zeroCount < 4) {
outputCharacters += bigRadices[quotient];
}
}
outputCharacters += CN_DOLLAR;
}

if (decimal != "") {
for (i = 0; i < decimal.length; i++) {
d = decimal.substr(i, 1);
if (d != "0") {
outputCharacters += digits[Number(d)] + decimals[i];
}
}
}

if (outputCharacters == "") {
outputCharacters = CN_ZERO + CN_DOLLAR;
}
if (decimal == "") {
outputCharacters += CN_INTEGER;
}
outputCharacters = CN_SYMBOL + outputCharacters;
return outputCharacters;
},
/**
* 转换节点的tagName
* 示例 var me=$(this); me=$.tagName(me,"span");
* @param self {object} 要转换的单个节点
* @param tag {string} 转换为tag类型节点
* @return {object} 转换后的节点对象
*/
tagName:function(self,tag){
var attrs=self.attributes,
newTag=document.createElement(tag);
for(var i=0,c;c=attrs[i++];){
if(!c.value||c.value==‘null‘)continue;
$(newTag).attr(c.name,c.value);
}
$(self).before($(newTag));
$(self).remove();
return $(newTag);
},
/**
* 在文本框指定的地方插入文本
* @param txtarea 文本框对象
* @param tag 文本
*/
insertText : function(txtarea, tag) {
// IE
if (document.selection) {
var theSelection = document.selection.createRange().text;
if (!theSelection) {
theSelection = tag;
}
txtarea.focus();
if (theSelection.charAt(theSelection.length - 1) == " ") {
theSelection = theSelection.substring(0,
theSelection.length - 1);
document.selection.createRange().text = theSelection
+ " ";
} else {
document.selection.createRange().text = theSelection;
}
// Mozilla
} else if (txtarea.selectionStart || txtarea.selectionStart == ‘0‘) {
var startPos = txtarea.selectionStart;
var endPos = txtarea.selectionEnd;
var myText = (txtarea.value).substring(startPos, endPos);
if (!myText) {
myText = tag;
}
if (myText.charAt(myText.length - 1) == " ") {
subst = myText.substring(0, (myText.length - 1)) + " ";
} else {
subst = myText;
}
txtarea.value = txtarea.value.substring(0, startPos)+ subst+ txtarea.value.substring(endPos,txtarea.value.length);
txtarea.focus();
var cPos = startPos + (myText.length);
txtarea.selectionStart = cPos;
txtarea.selectionEnd = cPos;
// All others
} else {
txtarea.value += tag;
txtarea.focus();
}
if (txtarea.createTextRange)
txtarea.caretPos = document.selection.createRange().duplicate();
},
confirm:function(selector,message,callback){
$(selector).click(function(){
if($(this).hasClass(‘disabled‘)) return false;

var ele=this;
$.ligerDialog.confirm(message,$lang.tip.msg,function(rtn) {
if(rtn){
if($.browser.msie){
$.gotoDialogPage(ele.href);
}
else{
location.href=ele.href;
}
}
});
return false;
});
},
/**
* Dialog窗口跳转
* @param {} url 地址
*/
gotoDialogPage: function (url) {
if($.browser.msie){
var a = document.createElement("a");
a.href=url;
document.body.appendChild(a);
a.click();
}
else{
location.href=url;
}
},
/**
* 克隆对象。
*/
cloneObject:function(obj){
var o = obj.constructor === Array ? [] : {};
for(var i in obj){
if(obj.hasOwnProperty(i)){
o[i] = typeof obj[i] === "object" ? cloneObject(obj[i]) : obj[i];
}
}
return o;
},
/**
* 清除表单
*/
clearQueryForm:function(){
$("input[name^=‘Q_‘],select[name^=‘Q_‘]").each(function(){
$(this).val(‘‘);
});
},
getFileExtName:function(fileName){
var pos=fileName.lastIndexOf(".");
if(pos==-1) return "";
return fileName.substring(pos +1);
},
//转成千分位。
comdify:function(v){
if(v&&v!=‘‘){
n=v+"";
var re=/\d{1,3}(?=(\d{3})+$)/g;
var n1=n.trim().replace(/^(\d+)((\.\d+)?)$/,function(s,s1,s2){
return s1.replace(re,"$&,")+s2;
});
return n1;
}
return v;
},
toNumber:function(v){
if(v&&v!=‘‘){
if(v.indexOf(‘,‘)==-1)
return v;
var ary=v.split(‘,‘);
var val=ary.join("");
return val;
}
return 0;
},
/**
* 上下移动
*
* @param {}
* obj 上移的对象
* @param {}
* isUp 是否上移
*/
moveTr : function(obj, isUp) {
var thisTr = $(obj).parents("tr");
if (isUp) {
var prevTr = $(thisTr).prev();
if (prevTr) {
thisTr.insertBefore(prevTr);
}
} else {
var nextTr = $(thisTr).next();
if (nextTr) {
thisTr.insertAfter(nextTr);
}
}
},
getCurrentDate:function(){

var myDate=new Date();
var month=myDate.getMonth()+1;
month=(month<10)?"0" + month:month;
return myDate.getFullYear() +"-" + month + "-"+ myDate.getDate();
}

});

/**
* 功能：给url添加一个当前时间日期数值，使页面不会被缓存。
*/
String.prototype.getNewUrl = function() {
// 如果url中没有参数。
var time = new Date().getTime();
var url = this;
//去除‘#’后边的字符
if (url.indexOf("#") != -1) {
var index=url.lastIndexOf("#",url.length-1);
url=url.substring(0, index);
}

while(url.endWith("#")){
url=url.substring(0, url.length-1);
}
url=url.replace(/(\?|&)rand=\d*/g, "");
if (url.indexOf("?") == -1) {
url += "?rand=" + time;
} else {
url += "&rand=" + time;
}
return url;
};

/**
* 功能：给url添加jsessionId 防止session丢失。
* @returns {String}
*/
String.prototype.getSessionUrl=function(){
//jsessionid
var url = this;
if(url.indexOf(";jsessionid=")!=-1){
return url;
}
if(url.indexOf("?")==-1){
url+=";jsessionid=" +__jsessionid;
}
else{
var aryUrl=url.split("?");
url=aryUrl[0] +";jsessionid=" +__jsessionId +"?" + aryUrl[1];
}
return url;
};

/**
* 判断字符串是否为空。
*
* @returns {Boolean}
*/
String.prototype.isEmpty = function() {
var rtn = (this == null || this == undefined || this.trim() == ‘‘);
return rtn;
};
/**
* 功能：移除首尾空格
*/
String.prototype.trim = function() {
return this.replace(/(^\s*)|(\s*$)/g, "");
};
/**
* 功能:移除左边空格
*/
String.prototype.lTrim = function() {
return this.replace(/(^\s*)/g, "");
};
/**
* 功能:移除右边空格
*/
String.prototype.rTrim = function() {
return this.replace(/(\s*$)/g, "");
};

/**
* 判断结束是否相等
*
* @param str
* @param isCasesensitive
* @returns {Boolean}
*/
String.prototype.endWith = function(str, isCasesensitive) {
if (str == null || str == "" || this.length == 0
|| str.length > this.length)
return false;
var tmp = this.substring(this.length - str.length);
if (isCasesensitive == undefined || isCasesensitive) {
return tmp == str;
} else {
return tmp.toLowerCase() == str.toLowerCase();
}

};
/**
* 判断开始是否相等
*
* @param str
* @param isCasesensitive
* @returns {Boolean}
*/
String.prototype.startWith = function(str, isCasesensitive) {
if (str == null || str == "" || this.length == 0
|| str.length > this.length)
return false;
var tmp = this.substr(0, str.length);
if (isCasesensitive == undefined || isCasesensitive) {
return tmp == str;
} else {
return tmp.toLowerCase() == str.toLowerCase();
}
};

/**
* 在字符串左边补齐指定数量的字符
*
* @param c
* 指定的字符
* @param count
* 补齐的次数使用方法： var str="999"; str=str.leftPad("0",3); str将输出 "000999"
* @returns
*/
String.prototype.leftPad = function(c, count) {
if (!isNaN(count)) {
var a = "";
for ( var i = this.length; i < count; i++) {
a = a.concat(c);
}
a = a.concat(this);
return a;
}
return null;
};

/**
* 在字符串右边补齐指定数量的字符
*
* @param c
* 指定的字符
* @param count
* 补齐的次数使用方法： var str="999"; str=str.rightPad("0",3); str将输出
* "999000"
* @returns
*/
String.prototype.rightPad = function(c, count) {
if (!isNaN(count)) {
var a = this;
for ( var i = this.length; i < count; i++) {
a = a.concat(c);
}
return a;
}
return null;
};

/**
* 对html字符进行编码用法： str=str.htmlEncode();
*
* @returns
*/
String.prototype.htmlEncode = function() {
return this.replace(/&/g, "&").replace(/</g, "<").replace(/>/g,
">").replace(/\"/g, """).replace(/\‘/g, "'");
};

/**
* 对html字符串解码用法： str=str.htmlDecode();
*
* @returns
*/
String.prototype.htmlDecode = function() {
return this.replace(/\&amp\;/g, ‘\&‘).replace(/\&gt\;/g, ‘\>‘).replace(
/\&lt\;/g, ‘\<‘).replace(/\&quot\;/g, ‘\‘‘).replace(/\&\#39\;/g,
‘\‘‘);
};

/**
* 对json中的特殊字符进行转义
*/
String.prototype.jsonEscape = function(){
return this.replace(/\"/g, """).replace(/\n/g,"&nuot;");
};

/**
* 对json中的特殊字符进行转义
*/
String.prototype.jsonUnescape = function(){
return this.replace(/"/g, "\"").replace(/&nuot;/g,"\n");
};

/**
* 字符串替换
*
* @param s1
* 需要替换的字符
* @param s2
* 替换的字符。
* @returns
*/
String.prototype.replaceAll = function(s1, s2) {
return this.replace(new RegExp(s1, "gm"), s2);
};

/**
* 获取url参数
*
* @returns {object}
*/
String.prototype.getArgs = function() {
var args = {};
if(this.indexOf("?")>-1){
var argStr = this.split("?")[1],
argAry = argStr.split("&");

for(var i=0,c;c=argAry[i++];){
var pos = c.indexOf("=");
if(pos==-1)continue;
var argName = c.substring(0,pos),
argVal = c.substring(pos+1);
argVal = decodeURIComponent(argVal);
args[argName] = argVal;
}
}
return args;
};

/**
* var str=String.format("姓名:{0},性别:{1}","ray","男");
* alert(str);
* @returns
*/
String.format=function(){
var template=arguments[0];
var args=arguments;
var str=template.replace(/\{(\d+)\}/g,function(m,i){
var k=parseInt(i)+1;
return args[k];
});
return str;
};

/**
* 字符串操作使用方法： var sb=new StringBuffer(); sb.append("aa"); sb.append("aa"); var
* str=sb.toString();
*
* @returns {StringBuffer}
*/
function StringBuffer() {
this.content = new Array;
}
StringBuffer.prototype.append = function(str) {
this.content.push(str);
};
StringBuffer.prototype.toString = function() {
return this.content.join("");
};

/**
* 日期格式化
* 格式 YYYY/yyyy/YY/yy 表示年份
* MM/M 月份
* W/w 星期
* dd/DD/d/D 日期
* hh/HH/h/H 时间
* mm/m 分钟
* ss/SS/s/S 秒
*/
Date.prototype.Format = function(formatStr)
{

if(!formatStr)return;
var str = formatStr;
var Week = [‘日‘,‘一‘,‘二‘,‘三‘,‘四‘,‘五‘,‘六‘];

str=str.replace(/yyyy|YYYY/,this.getFullYear());
str=str.replace(/yy|YY/,(this.getYear() % 100)>9?(this.getYear() % 100).toString():‘0‘ + (this.getYear() % 100));

str=str.replace(/MM/,(this.getMonth()+1)>9?(this.getMonth()+1).toString():‘0‘ + (this.getMonth()+1));
str=str.replace(/M/g,(this.getMonth()+1));

str=str.replace(/w|W/g,Week[this.getDay()]);

str=str.replace(/dd|DD/,this.getDate()>9?this.getDate().toString():‘0‘ + this.getDate());
str=str.replace(/d|D/g,this.getDate());

str=str.replace(/hh|HH/,this.getHours()>9?this.getHours().toString():‘0‘ + this.getHours());
str=str.replace(/h|H/g,this.getHours());
str=str.replace(/mm/,this.getMinutes()>9?this.getMinutes().toString():‘0‘ + this.getMinutes());
str=str.replace(/m/g,this.getMinutes());

str=str.replace(/ss|SS/,this.getSeconds()>9?this.getSeconds().toString():‘0‘ + this.getSeconds());
str=str.replace(/s|S/g,this.getSeconds());

return str;
};

/**
* 求两个时间的天数差日期格式为 yyyy-MM-dd 或 YYYY-MM-dd HH:mm:ss
*/
function daysBetween(DateOne,DateTwo)
{
var dayOne = ‘‘;
var dayTwo = ‘‘;
var timeOne = ‘‘;
var timeTwo = ‘‘;

if(DateOne!=null&&DateOne!=‘‘){
var arrOne = DateOne.split(‘ ‘);
dayOne = arrOne[0];
if(arrOne.length>1){
timeOne = arrOne[1];
}
}

if(DateTwo!=null&&DateTwo!=‘‘){
var arrTwo = DateTwo.split(‘ ‘);
dayTwo = arrTwo[0];
if(arrTwo.length>1){
timeTwo = arrTwo[1];
}
}

var OneMonth = 0;
var OneDay = 0;
var OneYear = 0;
if(dayOne!=null&&dayOne!=‘‘){
var arrDate = dayOne.split(‘-‘);
OneYear = parseInt(arrDate[0],10);
OneMonth = parseInt(arrDate[1],10);
OneDay = parseInt(arrDate[2],10);
}

return vflag;
};

/**
* 加载多个Script
* @param resources script file array :[‘file1.js‘,‘file2.js‘]
* @param callback function
* @returns void
*/

jQuery.getMutilScript = function( resources, callback ) {
var getScript = function(url,callback){
$.ajax({
url: url,
dataType: "script",
success: callback,
async:false
}).done(function(){
callback && callback();
});
};
var // reference declaration & localization
length = resources.length,
handler = function() { counter++; },
deferreds = [],
counter = 0,
idx = 0;

for ( ; idx < length; idx++ ) {
deferreds.push(
getScript( resources[ idx ], handler )
);
}
jQuery.when(deferreds ).done(function(){
callback && callback();
});
};

$(function(){
if($.browser){
if($.browser.version==‘6.0‘){
$("a.tipinfo").each(function(){
$(this).mouseover(function(){
$("span",$(this)).show();
});
$(this).mouseleave(function(){
$("span",$(this)).hide();
});
});
}}
});

jQuery.getWindowRect = function() {
var myWidth = 0, myHeight = 0;
if( typeof( window.innerWidth ) == ‘number‘ ) {
//Non-IE
myWidth = window.innerWidth;
myHeight = window.innerHeight;
} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
//IE 6+ in ‘standards compliant mode‘
myWidth = document.documentElement.clientWidth;
myHeight = document.documentElement.clientHeight;
} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
//IE 4 compatible
myWidth = document.body.clientWidth;
myHeight = document.body.clientHeight;
}
return {
height:myHeight,
width:myWidth
};
}

//禁用刷新。通过传入浏览器类型来指定禁用某个浏览器的刷新
function forbidF5(exp) {
var currentExplorer = window.navigator.userAgent;
//ie "MSIE" ,, firefox "Firefox" ,,Chrome "Chrome",,Opera "Opera",,Safari "Safari"
if (currentExplorer.indexOf(exp) >= 0) {
document.onkeydown = function(e) {
var ev = window.event || e;
var code = ev.keyCode || ev.which;
if (code == 116) {
ev.keyCode ? ev.keyCode = 0 : ev.which = 0;
cancelBubble = true;
return false;
}else{
return forbidBackSpace(e);
}
}
}
}

Date.prototype.format = function(format)
{
var o = {
"M+" : this.getMonth()+1, //month
"d+" : this.getDate(),//day
"h+" : this.getHours(), //hour
"m+" : this.getMinutes(), //minute
"s+" : this.getSeconds(), //second
"q+" : Math.floor((this.getMonth()+3)/3), //quarter
"S" : this.getMilliseconds() //millisecond
}

if(/(y+)/.test(format))
format = format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length));
for(var k in o)
if(new RegExp("("+ k +")").test(format))
format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] :("00"+ o[k]).substr((""+ o[k]).length));
return format;
}
/**
* 调整点击资源菜单时 tab导航栏向上浮动的问题；
*/
function justifyMargin(height,level,time){
if(window.navigator.userAgent.indexOf("Chrome")>=0){
window.setTimeout(function(){
var tabLinks = "";
if(level==3){
tabLinks = $("#framecenter > div.l-tab-links",parent.parent.document);
if($(".l-layout-left",parent.document)[0] && $("iframe",parent.document).length !=1) return;
}else{
tabLinks = $("#framecenter > div.l-tab-links",parent.document)
}
tabLinks.css("margin-top",parseInt(tabLinks.css("margin-top"))+ height +"px");
},time||0)
}
}
/**
* 修复所有树状结构右键菜单超出屏幕的问题
* @param e 传入点击事件event
*/
function justifyRightClickPosition(e){
var offsetHeight=parseInt($(".l-menu").eq(0).height());
var ePageY=parseInt(e.pageY);
var bodyOffsetHeight=parseInt(document.body.offsetHeight);
var h=$(window).height() ;
if(offsetHeight+ePageY>=bodyOffsetHeight-10){
e.pageY=ePageY-offsetHeight;
}
}
/**
* 修复list页面滚动条的bug ，用法在对应的页面的body上面加上 onload事件如： <body style="overflow: hidden;" onload="changeHeight()">
*/
function changeScrollHeight(noNeedFoldHeight,time){
window.setTimeout(function(){
$.setCookie("noNeedFoldHeight", noNeedFoldHeight||"");
if(noNeedFoldHeight) return;
$("body").css("overflow-y","hidden");
var currentTable=$(".table-grid.table-list");
var tableBody=currentTable.parent(),foldHeight=0;
if(!parent.document.querySelectorAll("#logoImg")[0])foldHeight = $("#searchForm").height();
var moreHeight = $(‘.panel-search‘).attr("moreHeight")||0;
// tableBody.height(($(window).height()-tableBody[0].offsetTop-$(".index_menu",$(parent.document)).height()/2-foldHeight-moreHeight)*0.9);
tableBody.height(($(window).height()-tableBody[0].offsetTop-foldHeight-moreHeight)*0.9);
tableBody.css("overflow-y","scroll");
tableBody.css("border","1px solid #A0BDBB");
currentTable.css("margin-top","0px");
},time||10)
}

//禁用键盘的BackSpace 回退键
//处理键盘事件禁止后退键（Backspace）密码或单行、多行文本框除外
function forbidBackSpace(e) {
var ev = e || window.event; //获取event对象
var obj = ev.target || ev.srcElement; //获取事件源
var t = obj.type || obj.getAttribute(‘type‘);
//获取事件源类型
//获取作为判断条件的事件类型
var vReadOnly = obj.readOnly;
var vDisabled = obj.disabled;
//处理undefined值情况
vReadOnly = (vReadOnly == undefined) ? false : vReadOnly;
vDisabled = (vDisabled == undefined) ? true : vDisabled;
//当敲Backspace键时，事件源类型为密码或单行、多行文本的，
//并且readOnly属性为true或disabled属性为true的，则退格键失效
var flag1 = ev.keyCode == 8 && (t == "password" || t == "text" || t == "textarea") && (vReadOnly == true || vDisabled == true);
//当敲Backspace键时，事件源类型非密码或单行、多行文本的，则退格键失效
var flag2 = ev.keyCode == 8 && t != "password" && t != "text" && t != "textarea";
//判断
if (flag2 || flag1) return false;
}
//禁止后退键作用于IE、Chrome
document.onkeydown = forbidBackSpace;

//测试使用
String.prototype.sayHello=function(){
alert("hello----chenrd");
};

js字符串（String扩展）

原文：https://www.cnblogs.com/rdchen/p/11091287.html

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