也许很多框架都自带了这样的弹出泡泡框，但我没接触过，现在需要用，于是便自己封装了一个，虽然还不完美，但已经可以用了。这个小控件可以重定义样式，通过传递配置参数，或修改默认配置参数都可以进行样式调整。不管怎么说，就当是练手，或给新人提供一个参考学习的机会也行吧
/*
* js 对象合并
*/
function extend(newObj, defaultObj) {
var result = {};
for (var p in defaultObj) {
result[p] = defaultObj[p];
if (typeof (defaultObj[p]) == " function ") {
defaultObj[p]();
} else {
for (var q in newObj) {
if (p == q) {
result[p] = newObj[q];
}
}
}
}
return result;
}
/*
* 弹出泡泡的默认样式
*/
var popMsgDefaultConfig = {
containner: $(document.body), //相对定位的dom对象或对象的id.
cuspStyle: "topleft", //相对定位的dom对象方位(topleft,topright,bottomleft,bottomright,leftup,leftdown,rightup,rightdown)
cuspLength: 30, //尖角长度
cuspWidth: 15, //尖角宽度
contentWidth: 160, //消息文本框宽度
contentHeight: 60, //消息文本框的高度
borderWidth: 2, //边框宽度
borderColor: "red", //边框颜色
backColor: "#EC90F6", //背景色
cuspShift: "60%", //尖角位于消息内容框上/下时，指左位移，尖角位于消息内容框左/右时，指的上位移。
contentShift: "20%", //弹出框位于目标框上/下时，指左位移，弹出框位于目标框左/右时，指的上位移。
textStyle: 'color: blue; font-size:small; font-family:"Microsoft YaHei";font-style:italic;'
}
/*
* 弹出泡泡的方法
* containner: 泡泡指向的dom对象id
* text: 需要显示的消息内容
* popMsgConfig： 自定义样式
* Example: popMsgShow("divUserName", "这是一个提示消息" { backColor: "gray", borderColor: "white", cuspStyle: "topleft",borderWidth: 1});
*/
function popMsgShow(containner, text, popMsgConfig) {
popMsgClose();
var config = extend(popMsgConfig, popMsgDefaultConfig);
//边框样式
var obj = $("#" + containner);
var offset = obj.offset();
var popMsg = $("<div id='divPopMsg'style='position:fixed;' ></div>");
var popContent = $("<div id='divContent' style='vertical-align:middle;text-align:center; line-height: " + config.contentHeight + "px;" + " height: " + config.contentHeight + "px" + "; width: " + config.contentWidth + "px" + "; border: " + config.borderColor + " solid;border-radius: 6px;background-color: " + config.backColor + "; " + config.textStyle + "'>" + text + "</div>");
var popCusp = $("<div id='divCusp' style='width: 0; height: 0; position:relative;'></div>");
var popCuspInner = $("<div id='divCuspInner' style='position: absolute;'></div>");
popContent.css({ borderWidth: config.borderWidth + "px", borderColor: config.borderColor, backgroundColor: config.backColor });
popCusp.append(popCuspInner);
popMsg.append(popContent);
if (config.cuspStyle == "topleft")
{
var innerTop = (config.cuspLength - 3*config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2*config.borderWidth) + "px";
var msgLeft = (offset.left + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.width() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ borderTopWidth: config.cuspLength + "px", borderTopStyle: "solid", borderTopColor: config.borderColor, borderRightWidth: config.cuspWidth + "px", borderRightStyle: "solid", borderRightColor: "transparent", marginTop: "-" + config.borderWidth + "px", marginLeft: config.cuspShift });
popCuspInner.css({ borderTopWidth: innerTop, borderTopStyle: "solid", borderTopColor: config.backColor, borderRightWidth: innerWidth, borderRightStyle: "solid", borderRightColor: "transparent", top: "-" + config.cuspLength + "px", left: config.borderWidth + "px" });
popMsg.css({ top: (offset.top - config.contentHeight - config.cuspLength) + "px", left: msgLeft });
popMsg.append(popCusp);
}
if (config.cuspStyle == "topright") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.left + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.width() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ borderTopWidth: config.cuspLength + "px", borderTopStyle: "solid", borderTopColor: config.borderColor, borderLeftWidth: config.cuspWidth + "px", borderLeftStyle: "solid", borderLeftColor: "transparent", marginTop: "-" + config.borderWidth + "px", marginLeft: config.cuspShift });
popCuspInner.css({ borderTopWidth: innerTop, borderTopStyle: "solid", borderTopColor: config.backColor, borderLeftWidth: innerWidth, borderLeftStyle: "solid", borderLeftColor: "transparent", top: "-" + config.cuspLength + "px", left: "-" + (config.cuspWidth - config.borderWidth) + "px" });
popMsg.css({ top: (offset.top - config.contentHeight - config.cuspLength) + "px", left: msgLeft });
popMsg.append(popCusp);
}
if (config.cuspStyle == "bottomleft") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.left + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.width() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ borderBottomWidth: config.cuspLength + "px", borderBottomStyle: "solid", borderBottomColor: config.borderColor, borderRightWidth: config.cuspWidth + "px", borderRightStyle: "solid", borderRightColor: "transparent", marginTop: "-" + config.borderWidth + "px", marginLeft: config.cuspShift });
popCuspInner.css({ borderBottomWidth: innerTop, borderBottomStyle: "solid", borderBottomColor: config.backColor, borderRightWidth: innerWidth, borderRightStyle: "solid", borderRightColor: "transparent", top: (4 * config.borderWidth) + "px", left: config.borderWidth + "px" });
popMsg.css({ top: (offset.top + obj.height()) + "px", left: msgLeft });
popCusp.insertBefore(popContent);
}
if (config.cuspStyle == "bottomright") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.left + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.width() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ borderBottomWidth: config.cuspLength + "px", borderBottomStyle: "solid", borderBottomColor: config.borderColor, borderLeftWidth: config.cuspWidth + "px", borderLeftStyle: "solid", borderLeftColor: "transparent", marginTop: "-" + config.borderWidth + "px", marginLeft: config.cuspShift });
popCuspInner.css({ borderBottomWidth: innerTop, borderBottomStyle: "solid", borderBottomColor: config.backColor, borderLeftWidth: innerWidth, borderLeftStyle: "solid", borderLeftColor: "transparent", top: (3*config.borderWidth) + "px", left: "-" + (config.cuspWidth - config.borderWidth) + "px" });
popMsg.css({ top: (offset.top + obj.height()) + "px", left: msgLeft });
popCusp.insertBefore(popContent);
}
if (config.cuspStyle == "leftup") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.top + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.height() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ float: "left", borderTopWidth: config.cuspWidth + "px", borderTopStyle: "solid", borderTopColor: config.borderColor, borderLeftWidth: config.cuspLength + "px", borderLeftStyle: "solid", borderLeftColor: "transparent", marginLeft: "-" + config.borderWidth + "px", marginTop: (config.cuspWidth - 2*config.borderWidth) + "px" });
popCuspInner.css({ borderTopWidth: innerWidth, borderTopStyle: "solid", borderTopColor: config.backColor, borderLeftWidth: innerTop, borderLeftStyle: "solid", borderLeftColor: "transparent", top: "-" + (config.cuspWidth - config.borderWidth) + "px", left: "-" + (config.cuspLength - 4*config.borderWidth) + "px" });
popMsg.css({ top: msgLeft, left: (offset.left + obj.width() + config.cuspLength) + "px" });
popContent.css({float: "right"});
popCusp.insertBefore(popContent);
}
if (config.cuspStyle == "leftdown") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.top + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.height() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ float: "left", borderTopWidth: config.cuspWidth + "px", borderTopStyle: "solid", borderTopColor: config.borderColor, borderLeftWidth: config.cuspLength + "px", borderLeftStyle: "solid", borderLeftColor: "transparent", marginLeft: "-" + config.borderWidth + "px", marginTop: (config.cuspWidth - 2*config.borderWidth) + "px" });
popCuspInner.css({ borderTopWidth: innerWidth, borderTopStyle: "solid", borderTopColor: config.backColor, borderLeftWidth: innerTop, borderLeftStyle: "solid", borderLeftColor: "transparent", top: "-" + (config.cuspWidth - config.borderWidth) + "px", left: "-" + (config.cuspLength - 4 * config.borderWidth) + "px" });
popMsg.css({ top: msgLeft, left: (offset.left + obj.width() + config.cuspLength) + "px" });
popContent.css({float: "right"});
popCusp.insertBefore(popContent);
}
if (config.cuspStyle == "rightup") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.top + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.height() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ float: "right", borderTopWidth: config.cuspWidth + "px", borderTopStyle: "solid", borderTopColor: config.borderColor, borderRightWidth: config.cuspLength + "px", borderRightStyle: "solid", borderRightColor: "transparent", marginLeft: "-" + config.borderWidth + "px", marginTop: (config.cuspWidth - 2 * config.borderWidth) + "px" });
popCuspInner.css({ borderTopWidth: innerWidth, borderTopStyle: "solid", borderTopColor: config.backColor, borderRightWidth: innerTop, borderRightStyle: "solid", borderRightColor: "transparent", top: "-" + (config.cuspWidth - config.borderWidth) + "px", left: "-" + config.borderWidth + "px" });
popMsg.css({ top: msgLeft, left: (offset.left - popContent.width() - config.cuspLength) + "px" });
popContent.css({ float: "left" });
popCusp.insertBefore(popContent);
}
if (config.cuspStyle == "rightdown") {
var innerTop = (config.cuspLength - 3 * config.borderWidth) + "px";
var innerWidth = (config.cuspWidth - 2 * config.borderWidth) + "px";
var msgLeft = (offset.top + (config.contentShift.indexOf("px") > 0 ? parseInt(config.contentShift) : obj.height() * parseInt(config.contentShift) / 100)) + "px";
popCusp.css({ float: "right", borderBottomWidth: config.cuspWidth + "px", borderBottomStyle: "solid", borderBottomColor: config.borderColor, borderRightWidth: config.cuspLength + "px", borderRightStyle: "solid", borderRightColor: "transparent", marginLeft: "-" + config.borderWidth + "px", marginTop: (config.cuspWidth - 2 * config.borderWidth) + "px" });
popCuspInner.css({ borderBottomWidth: innerWidth, borderBottomStyle: "solid", borderBottomColor: config.backColor, borderRightWidth: innerTop, borderRightStyle: "solid", borderRightColor: "transparent", top: config.borderWidth + "px", left: "-" + config.borderWidth + "px" });
popMsg.css({ top: msgLeft, left: (offset.left - popContent.width() - config.cuspLength) + "px" });
popContent.css({ float: "left" });
popCusp.insertBefore(popContent);
}
$(document.body).append(popMsg);
}
/*
* 关闭泡泡的方法
*/
function popMsgClose() {
var popmsg = $("#divPopMsg");
if (popmsg) {
$("#divPopMsg").remove();
}
}
原文：http://blog.csdn.net/foren_whb/article/details/45768553