Simple JS Implementation detects user password security

Last Update:2017-08-24 Source: Internet

Author: User

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<! 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= "HTML; Charset=utf-8 "/>
<title> simple JS implementation to detect user password security </title>
<script language=javascript>
// The Charmode function
//tests which type of character is part of
function Charmode (in) {
if (in>=48 && in <=57)/number
return 1;
if (in>=65 && in <=90)//capital Letter
Return 2;
if (in>=97 && in <=122)//lowercase
return 4;
else
return 8;//special characters
}
//bittotal function
//The total number of modes
function bittotal (num) {
modes=0;
for (i=0;i<4;i++) {
if (num & 1) modes++;
Num>>>=1;
}
return modes;
}
//checkstrong function
//Return password strength level
function Checkstrong (sPW) {
if (spw.length<=4)
returns 0;//password Too short
Modes=0;
for (i=0;i<spw.length;i++) {
//test the category of each character and count the total number of modes
Modes|=charmode (Spw.charcodeat (i));
}
return Bittotal (Modes);
}
//pwstrength function
//When user releases keyboard or password input box loses focus, different colors appear according to different levels
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= ""
Enter Password: <input type= "password" onkeyup= "Pwstrength" (this.value) "onblur=" Pwstrength (this.value) "><br>
Password strength: <table width=" 217 "border=" 1 "cellspacing=" 0 "cellpadding=" 1 " Bordercolor= "#cccccc"
height= "style=" Display:inline
<tr align= "center" bgcolor= "#eeeeee" >
<td width= "33%" id= "strength_l" > Weak </td>
<td width= "33%" id= "strength_m" > </td>
<TD width= "33%" id= "Strength_h" > Strong </td>
</tr>
</table>
</form>
<p Style= "margin-top:50px;" > Find more code, please visit: <a href= "http://www.jzread.com" target= "_blank" > Web page Production tutorial </a></p>
</body>
</html>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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