這篇文章主要介紹了javascripit實現密碼強度檢測，大家參考使用吧
代碼如下: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title> 密碼強度檢測 </title> <style type="text/css"> body{font:12px/1.5 Arial;} input{float:left;font-size:12px;width:150px;font-family:arial;border:1px solid #ccc;padding:3px;} input.correct{border:1px solid green;} input.error{border:1px solid red;} #tips{float:left;margin:2px 0 0 20px;} #tips span{float:left;width:50px;height:20px;color:#fff;overflow:hidden;background:#ccc;margin-right:2px;line-height:20px;text-align:center;} #tips.s1 .active{background:#f30;} #tips.s2 .active{background:#fc0;} #tips.s3 .active{background:#cc0;} #tips.s4 .active{background:#090;} </style> <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", "強", "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]) } }; /** 強度規則 + ------------------------------------------------------- + 1) 任何少於6個字符的組合，弱；任何字符數的同類字符組合，弱； 2) 任何字符數的兩類字符組合，中； 3) 12位字符數以下的三類或四類字符組合，強； 4) 12位字符數以上的三類或四類字符組合，非常好。 + ------------------------------------------------------- + **/ //檢測密碼強度 function checkStrong(sValue) { var modes = 0; if (sValue.length < 6) return modes; if (/d/.test(sValue)) modes++; //數字 if (/[a-z]/.test(sValue)) modes++; //小寫 if (/[A-Z]/.test(sValue)) modes++; //大寫 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> </head> <body> <input type="password" value="" maxlength="16" /> <div id="tips"> <span></span> <span></span> <span></span> <span></span> </div> </body> </html>