[JavaScript]代码    

(function($){        $.fn.extend({             pwdstr: function(el) {        return this.each(function() {                            $(this).keyup(function(){        $(el).html(getTime($(this).val()));       });              function getTime(str){              var chars = 0;       var rate = 2800000000;              if((/[a-z]/).test(str)) chars +=  26;       if((/[A-Z]/).test(str)) chars +=  26;       if((/[0-9]/).test(str)) chars +=  10;       if((/[^a-zA-Z0-9]/).test(str)) chars +=  32;         var pos = Math.pow(chars,str.length);       var s = pos/rate;              var decimalYears = s/(3600*24*365);       var years = Math.floor(decimalYears);              var decimalMonths =(decimalYears-years)*12;       var months = Math.floor(decimalMonths);              var decimalDays = (decimalMonths-months)*30;       var days = Math.floor(decimalDays);              var decimalHours = (decimalDays-days)*24;       var hours = Math.floor(decimalHours);              var decimalMinutes = (decimalHours-hours)*60;       var minutes = Math.floor(decimalMinutes);              var decimalSeconds = (decimalMinutes-minutes)*60;       var seconds = Math.floor(decimalSeconds);              var time = [];              if(years > 0){        if(years == 1)         time.push("1 year, ");        else         time.push(years + " years, ");       }       if(months > 0){        if(months == 1)         time.push("1 month, ");        else         time.push(months + " months, ");       }       if(days > 0){        if(days == 1)         time.push("1 day, ");         else         time.push(days + " days, ");       }       if(hours > 0){        if(hours == 1)         time.push("1 hour, ");        else         time.push(hours + " hours, ");       }       if(minutes > 0){        if(minutes == 1)         time.push("1 minute, ");        else         time.push(minutes + " minutes, ");       }       if(seconds > 0){        if(seconds == 1)         time.push("1 second, ");        else         time.push(seconds + " seconds, ");       }              if(time.length <= 0)        time = "less than one second, ";       else if(time.length == 1)        time = time[0];       else        time = time[0] + time[1];          return time.substring(0,time.length-2);       }             });          }       });   })(jQuery);