Today's homework, the overall is still possible ...

varHr= "; varUrl= "http://www.baidu.com/about/news.php"; varIndex=url.indexof (". php");//gets the string. The subscript value of PHPdocument.write (url.substring (index));//outputs the end of the specified subscript string with the substring methoddocument.write (HR); varstr= "JavaScript"; varLen=str.length;//gets the length of the string             for(varI=len-1;i>=0;--i) {//backward traversal of output from the end of a stringdocument.write (Str.charat (i));//the output string corresponds to the underlying value} document.write (HR); vartoday=NewDate (); varDays=today.gettime ();//gets the current system time            varcomeday=NewDate ("1994-09-02");//Create Birth Time            varcomedays=Comeday.gettime (); varNow=days-comedays;//subtract the time of birth from the current time to get the median differenceNow=math.ceil (NOW/1000/3600/24);//milliseconds converted to days, and then Ceil method to take up the whole document.write ("Distance Birth date 1994-09-02 already:" +now+ "Days! ");            document.write (HR); //var username=window.prompt ("Please enter user name! ");            //var Panduan = function () {//Now the variable is a function            //var arr=["*", "%", "&", "<", ">", "!", "@", "#";            //var len=arr.length;//gets the length of the array            //var strlen=username.length;//gets the string length of the user input            //For (Var i=0;i<strlen;++i) {            //For (Var j=0;j<len;++j) {            //If (Arr[j]==username.charat (i)) {//Determines whether the characters in the array are the same as the characters entered by the user            //return 0;            //              }            //          }            //      }            //return 1;            // };            //If (Panduan (username)) {//Call Note if function parentheses            //alert ("The user name is legal! ");            //}else {            //alert ("The user name is illegal! ");            // }            vararr=[1,5,13,11,23,34,20]; vartrun=function(A, b) {returnA-b;            } document.write (Arr.sort (Trun));            document.write (HR); vartoday=NewDate (); //var year=today.getfullyear ();//Year 4 bit            //var moth=today.getmonth ();//month            //var data=today.getdate ();//Date            //var week=today.getday ();//0-6 weeks            //var hours=today.gethours ();//hour            //var miu=today.getminutes ();//Minutes            //var sec=today.getseconds ();//sec            //var secc=today.getmilliseconds ();//milliseconds            varTodays=today.tolocalestring ();//output Current system time Datedocument.write ("Today is:" +todays);            document.write (HR); varstr= "Guangzhou Chuan Zhi Education, is a professional training of educational institutions!" "; varre=/education/g;//Regular Expressions don't quite understanddocument.write (Str.replace (Re, ' education '));//Repace replacing a specified character

Today's homework, the overall is still possible ...