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js password strength detection_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:21:081554browse

The example in this article explains the implementation code of js password strength detection and shares it with you for your reference. The specific content is as follows

Operation rendering:

This JavaScript code is more practical. It determines the strength of the password entered by the user when completing user registration, and divides it into three levels: strong, weak, and medium. It can display the corresponding password strength level according to the password entered by the user, making it convenient for users to improve their input. .

Implementation code: 

<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>

Let’s take a look at the renderings of this one first.

Detailed content: 

<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>

The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.

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