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本文实例讲解了js密码强度检测的实现代码,分享给大家供大家参考,具体内容如下
运行效果图:


这段JavaScript代码比较实用,它完成用户注册时判断用户输入密码的强度,分强、弱、中三等级,它可以根据用户输入的密码显示对应的密码强弱等级,方便用户改进输入。

实现代码:

<html><head><title>JS判断密码强度</title><script language=javascript> //判断输入密码的类型 function CharMode(iN){ if (iN>=48 && iN <=57) //数字 return 1; if (iN>=65 && iN <=90) //大写 return 2; if (iN>=97 && iN <=122) //小写 return 4; else return 8;} //bitTotal函数 //计算密码模式 function bitTotal(num){ modes=0; for (i=0;i<4;i++){ if (num & 1) modes++; num>>>=1; } return modes; } //返回强度级别 function checkStrong(sPW){ if (sPW.length<=4) return 0; //密码太短 Modes=0; for (i=0;i<sPW.length;i++){ //密码模式 Modes|=CharMode(sPW.charCodeAt(i)); } return bitTotal(Modes); }//显示颜色 function pwStrength(pwd){ O_color="#eeeeee"; L_color="#FF0000"; M_color="#FF9900"; H_color="#33CC00"; if (pwd==null||pwd==""){ Lcolor=Mcolor=Hcolor=O_color; } else{ S_level=checkStrong(pwd); switch(S_level) { case 0: Lcolor=Mcolor=Hcolor=O_color; case 1: Lcolor=L_color; Mcolor=Hcolor=O_color; break; case 2: Lcolor=Mcolor=M_color; Hcolor=O_color; break; default: Lcolor=Mcolor=Hcolor=H_color; } } document.getElementById("strength_L").style.background=Lcolor; document.getElementById("strength_M").style.background=Mcolor; document.getElementById("strength_H").style.background=Hcolor; return; } </script></head><body> <form name=form1 action="" > 密码:<input type=password size=8 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)> <br>密码强度: <table width="210" border="1" cellspacing="0" cellpadding="1" bordercolor="#eeeeee" height="22" style="display:inline"> <tr align="center" bgcolor="#f5f5f5"> <td width="33%" id="strength_L">弱</td> <td width="33%" id="strength_M">中</td> <td width="33%" id="strength_H">强</td> </tr> </table> </form></body></html>

这一款先看一看效果图。


具体内容:

<script>function AuthPasswd(string) { if(string.length >=6) {if(/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string) && /W+D+/.test(string)) { noticeAssign(1);}else if(/[a-zA-Z]+/.test(string) || /[0-9]+/.test(string) || /W+D+/.test(string)) { if(/[a-zA-Z]+/.test(string) && /[0-9]+/.test(string)) {noticeAssign(-1); }else if(/[a-zA-Z]+/.test(string) && /W+D+/.test(string)) {noticeAssign(-1); }else if(/[0-9]+/.test(string) && /W+D+/.test(string)) {noticeAssign(-1); }else{noticeAssign(0); }} }else{noticeAssign(null);}} function noticeAssign(num) { if(num == 1) {$("#weak").css({backgroundColor:"#009900"});$("#middle").css({backgroundColor:"#009900"});$("#strength").css({backgroundColor:"#009900"});$("#strength").html("很强");$("#middle").html("");$("#weak").html(""); }else if(num == -1){$("#weak").css({backgroundColor:"#ffcc33"});$("#middle").css({backgroundColor:"#ffcc33"});$("#strength").css({backgroundColor:""});$("#weak").html("");$("#middle").html("中");$("#strength").html(""); }else if(num ==0) {$("#weak").css({backgroundColor:"#dd0000"});$("#middle").css({backgroundColor:""});$("#strength").css({backgroundColor:""});$("#weak").html("弱");$("#middle").html("");$("#strength").html(""); }else{$("#weak").html(" ");$("#middle").html(" ");$("#strength").html(" ");$("#weak").css({backgroundColor:""});$("#middle").css({backgroundColor:""});$("#strength").css({backgroundColor:""}); }}</script>
以上就是本文的全部内容,希望对大家学习javascript程序设计有所帮助。