改善用户体验制作实用密码强度提示

日期：02-01 来源：webjx| 作者：

<body>
<form name="form1">
<label for="pwd">用户密码</label>
<input type="password" name="pwd" onblur="chkpwd(this)" />
<div id="chkResult"></div>
<label for="pwd2">重复密码</label>
<input type="password" name="pwd2" />
</form>
<script type="text/javascript">
function chkpwd(obj){
  var t=obj.value;
  var id=getResult(t);

  //定义对应的消息提示
  var msg=new Array(4);
  msg[0]="密码过短。";
  msg[1]="密码强度差。";
  msg[2]="密码强度良好。";
  msg[3]="密码强度高。";

  var sty=new Array(4);
  sty[0]=-45;
  sty[1]=-30;
  sty[2]=-15;
  sty[3]=0;

  var col=new Array(4);
  col[0]="gray";
  col[1]="red";
  col[2]="#ff6600";
  col[3]="Green";

  //设置显示效果
  var bImg="http://bbs.blueidea.com/attachments/2006/12/7/pwdlen_dSIPeEGQWxfO.gif";//一张显示用的图片
  var sWidth=300;
  var sHeight=15;
  var Bobj=document.getElementById("chkResult");

  Bobj.style.fontSize="12px";
  Bobj.style.color=col[id];
  Bobj.style.width=sWidth + "px";
  Bobj.style.height=sHeight + "px";
  Bobj.style.lineHeight=sHeight + "px";
  Bobj.style.background="url(" + bImg + ") no-repeat left " + sty[id] + "px";
  Bobj.style.textIndent="20px";
  Bobj.innerHTML="检测提示：" + msg[id];
}

//定义检测函数,返回0/1/2/3分别代表无效/差/一般/强
function getResult(s){
  if(s.length < 4){
   return 0;
  }
  var ls = 0;
  if (s.match(/[a-z]/ig)){
   ls++;
  }
  if (s.match(/[0-9]/ig)){
   ls++;
  }
if (s.match(/(.[^a-z0-9])/ig)){
   ls++;
  }
  if (s.length < 6 && ls > 0){
   ls--;
  }
  return ls
}
</script>
</body>