$.fn.passwordStrength = function(options){

	return this.each(function(){

		var that = this;that.opts = {};

		that.opts = $.extend({}, $.fn.passwordStrength.defaults, options);

		

		that.div = $(that.opts.targetDiv);

		that.defaultClass = that.div.attr('class');

		

		that.percents = (that.opts.classes.length) ? 100 / that.opts.classes.length : 100;

		 v = $(this).keyup(function(){

			if( typeof el == "undefined" )

				this.el = $(this);

			var s = getPasswordStrength (this.value);

			var p = this.percents;

			var t = Math.floor( s / p );			

			if( 100 <= s ) t = this.opts.classes.length - 1;	

			this.div.removeAttr('class').addClass( this.defaultClass ).addClass( this.opts.classes[ t ]);	

		})		

	});

	//获取密码强度

	function getPasswordStrength(H){

		var D=(H.length);

		if(D>5){

			D=5

		}

		var F=H.replace(/[0-9]/g,"");

		var G=(H.length-F.length);

		if(G>3){G=3}

		var A=H.replace(/\W/g,"");

		var C=(H.length-A.length);

		if(C>3){C=3}

		var B=H.replace(/[A-Z]/g,"");

		var I=(H.length-B.length);

		if(I>3){I=3}

		var E=((D*10)-20)+(G*10)+(C*15)+(I*10);

		if(E<0){E=0}

		if(E>100){E=100}

		return E

	}



};

	

$.fn.passwordStrength.defaults = {

	classes : Array('is10','is20','is30','is40','is50','is60','is70','is80','is90','is100'),

	targetDiv : '#passwordStrengthDiv',

	cache : {}

}

$.passwordStrength = {};

$.passwordStrength.getRandomPassword = function(size){

		var chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

		var size = size || 8;

		var i = 1;

		var ret = ""

		while ( i <= size ) {

			$max = chars.length-1;

			$num = Math.floor(Math.random()*$max);

			$temp = chars.substr($num, 1);

			ret += $temp;

			i++;

		}

		return ret;			

}