JavaScript表单——验证密码强度

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第一种：

HTML部分：

<!DOCTYPE HTML> <html lang="en"> <head> <meta charset="utf-8"/> <title>密码强度</title> <style type="text/css"> #passStrength{height:6px;width:120px;border:1px solid #ccc;padding:2px;} .strengthLv1{background:red;height:6px;width:40px;} .strengthLv2{background:orange;height:6px;width:80px;} .strengthLv3{background:green;height:6px;width:120px;} </style> </head> <body> <input type="password" name="pass" id="pass" maxlength="16"/> <div class="pass-wrap"> <em>密码强度：</em> <div id="passStrength"></div> </div> </body> </html> <script type="text/javascript" src="js/passwordStrength.js"></script> <script type="text/javascript"> new PasswordStrength('pass','passStrength'); </script>

JavaScript部分：

function PasswordStrength(passwordID,strengthID){ this.init(strengthID); var _this = this; document.getElementById(passwordID).onkeyup = function(){ _this.checkStrength(this.value); } }; PasswordStrength.prototype.init = function(strengthID){ var id = document.getElementById(strengthID); var div = document.createElement('div'); var strong = document.createElement('strong'); this.oStrength = id.appendChild(div); this.oStrengthTxt = id.parentNode.appendChild(strong); }; PasswordStrength.prototype.checkStrength = function (val){ var aLvTxt = ['','低','中','高']; var lv = 0; if(val.match(/[a-z]/g)){lv++;} if(val.match(/[0-9]/g)){lv++;} if(val.match(/(.[^a-z0-9])/g)){lv++;} if(val.length < 6){lv=0;} if(lv > 3){lv=3;} this.oStrength.className = 'strengthLv' + lv; this.oStrengthTxt.innerHTML = aLvTxt[lv]; };

第二种：

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>验证密码强度</title> <style type="text/css"> *{margin: 0;padding: 0;} body{background:#ccc;} #demo{width:400px;padding:50px;background:#efefef;border: 1px solid #999;line-height:40px;margin:100px auto 0;} #strength_length{height:6px;width:100px;padding:2px;border: 1px solid #ccc;} .lv1{background:red;} .lv2{background:blue;width:200px;} .lv3{background:green;width:300px;} </style></head><body> <div id="demo"> <label for="ipt">密码：</label> <input type="text" id="ipt"><br/> <em>密码强度：</em><em id="strength"></em> <div id="strength_length"></div> </div></body><script type="text/javascript"> (function(window){ function $(id){ return document.getElementById(id); }; var arr = ["","低","中","高"]; // 获取对象 var ipt = $("ipt"),strength = $("strength"),strLength = $("strength_length"); // 密码输入事件 ipt.onkeyup = function(){ var s = 0; var txt = this.value; if( /[a-zA-Z]/.test(txt) ){ s++; }; if( /[0-9]/.test(txt) ){ s++; }; if( /[^0-9a-zA-Z]/.test(txt) ){ s++; }; if( txt.length <6 ){ s = 0; }; strength.innerHTML = arr[s]; strLength.className = "lv" + s; } })(window)</script></html>

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