[javascript学习指南]javascript 密码强度验证程序代码

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我们先来看强度规则

1) 任何少于6个字符的组合，弱；任何字符数的同类字符组合，弱；       

2) 任何字符数的两类字符组合，中；       

3) 12位字符数以下的三类或四类字符组合，强；       

4) 12位字符数以上的三类或四类字符组合，非常好。

   

<script type="text/javascript">       

window.onload = function () {           

var oTips = document.getElementById("tips");           

var oInput = document.getElementsByTagName("input")[0];           

var aSpan = oTips.getElementsByTagName("span");           

var aStr = ["弱", "中", "强", "非常好"];           

var i = 0;

oInput.onkeyup = oInput.onfocus = oInput.onblur = function () {               

var index = checkStrong(this.value);               

this.className = index ? "correct" : "error";               

oTips.className = "s" + index;               

for (i = 0; i < aSpan.length; i++) aSpan[i].className = aSpan[i].innerHTML = "";               

index && (aSpan[index - 1].className = "active", aSpan[index - 1].innerHTML = aStr[index - 1])             }         };       

//检测密码强度       

function checkStrong(sValue) {           

var modes = 0;           

if (sValue.length < 6) return modes;           

if (/d/.test(sValue)) modes++; //数字           

if (/[a-z]/.test(sValue)) modes++; //小写           

if (/[A-Z]/.test(sValue)) modes++; //大写            

if (/W/.test(sValue)) modes++; //特殊字符           

switch (modes) {               

case 1:                   

return 1;                   

break;               

case 2:                   

return 2;               

case 3:               

case 4:                   

return sValue.length < 12 ? 3 : 4                   

break;             }         }   

</script>

word" value="" maxlength="16" />            

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