本文實例講解了js密碼強度檢測的實現代碼，分享給大家供大家參考，具體內容如下
運行效果圖：
這段JavaScript代碼比較實用，它完成用戶注冊時判斷用戶輸入密碼的強度，分強、弱、中三等級，它可以根據用戶輸入的密碼顯示對應的密碼強弱等級，方便用戶改進輸入。
實現代碼：
<html><head><title>JS判斷密碼強度</title><script language=javascript> //判斷輸入密碼的類型 function CharMode(iN){ if (iN>=48 && iN <=57) //數字 return 1; if (iN>=65 && iN <=90) //大寫 return 2; if (iN>=97 && iN <=122) //小寫 return 4; else return 8; } //bitTotal函數 //計算密碼模式 function bitTotal(num){ modes=0; for (i=0;i<4;i++){ if (num & 1) modes++; num>>>=1; } return modes; } //返回強度級別 function checkStrong(sPW){ if (sPW.length<=4) return 0; //密碼太短 Modes=0; for (i=0;i<sPW.length;i++){ //密碼模式 Modes|=CharMode(sPW.charCodeAt(i)); } return bitTotal(Modes); } //顯示顏色 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="" > 密碼:<input type=password size=8 onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)> <br>密碼強度: <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">強</td> </tr> </table> </form></body></html>這一款先看一看效果圖。
具體內容：
<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('很強'); $('#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內容，希望對大家學習javascript程序設計有所幫助。
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