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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body> <script> var arr=[‘100px‘,‘abc‘-6,[],-98765,34,-2,0,‘300‘, ,function () {alert(1);},null,document,[],true,‘200px‘-30,‘23.45元‘,5,Number(‘abc‘),function () {alert(3);}]; var b=[]; for (var i = 0; i < arr.length; i++) { // if (isNaN(arr[i])) { // }else{ // alert(arr[i]+‘是数字‘) // } // if (Number(arr[i])===parseFloat(arr[i])) { // alert(arr[i]+‘是数字‘) // }else{ // } // if (typeof (arr[i]) ==‘number‘& arr[i]=== arr[i]) { // alert(arr[i]+‘是数字‘) // }else{ // }}// ------------------------查找NAN的位置-------- // if ((arr[i])==(arr[i])) { // }else{ // alert(i) // }}// ------------------------判断数字--------// if (parseFloat(arr[i] )|parseFloat(arr[i] )==0) {// alert(arr[i] )// }else{ // }// }// ------------------------判断最大数字--------if (parseFloat(arr[i] )|parseFloat(arr[i] )==0) { b.push(arr[i]); // alert(b) } else{ }} document.write(b);document.write("</br>");// ------------------------数组转换数字-------- for (var j = 0; j<b.length; j++) { b[j]=parseInt(b[j]) }document.write(b);// ------------------------找最大-------- var c=b[0] for (var j = 0; j<b.length; j++) { if (c<b[j]) { c=b[j]; }else{ } } document.write("</br>");document.write(c); </script></body></html> |
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<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> #content{color: #c3c3c3} </style></head><body> <span>请输入qq号码：</span> <input type="text" id="put"> <input type="submit" value="判断"id="pan"> <span id="content"></span> <script> var put=document.getElementById(‘put‘) c=document.getElementById(‘content‘) pan=document.getElementById(‘pan‘); function fn () { c.innerHTML=""; if (put.value.length==0) { c.innerHTML=‘还没有输入呢‘ } else if (put.value.length>10|put.value.length<5) { c.innerHTML=‘请输入5位以上并且10位以内‘ } else if (put.value.charAt(0)==0) { c.innerHTML=‘第一位不能是0‘ } else if ( isNaN(put.value) ) { c.innerHTML=‘只能输入数字‘ } else if (parseInt(put.value)==parseFloat(put.value)) { }else { c.innerHTML=‘不能输入小数‘ } } pan.onclick=fn; </script></body></html> |
原文：https://www.cnblogs.com/chenguopa/p/15225656.html