Javascript:dom, String, array, time

JavaScript consists of:

1) ECMAscript Specifies the syntax part of JS: The usual functions of string, array and time

String: Create string, with length

  //string Use definition 1:            var str= "ADSAFDSAFD";            Mode 2: Use the String Object            var str2=new string ("Sadsaq");       //The length of the word A:            var strlength=str2.length;            document.write (strlength);                   

//Determines whether a string contains a specified string:            var stremail= "[email protected]";            var check= "@";            var res=stremail.indexof (check);            document.write (res+ "<br/>");

String intercept//start intercept from the index of the parameter, and intercept to the end of the string            var newstr=stremail.substring (5);            document.write (newstr+ "<br/>");

 //intercept from the position of parameter 1, intercept to parameter 2, but does not contain parameter 2  var nere=st            Remail.substring (5.8); document.write (nere+ " <  BR  Span style= "COLOR: #0000ff" >/>  //from the position of the parameter 1, the parameter 2 is to intercept a few  var ste=stremail.substr (5,3); document.write (ste+ " <  BR  />  

//Case conversion//string with all words converted to uppercase            var str5=stremail.touppercase ();            document.write (str5+ "<br/>");            //Convert to lowercase            var str6=str5.tolowercase ();            document.write (STR6);

Array:

//Array declaration Method 1: Literal way            var arystr=["Edison Chen", "Daniel Wu", "Peng";            Alert (arystr[1]);            //Array Declaration Method 2: Constructor mode            var arystu2=new Array ();            arystu2[0]= "Huang Xiaoming";            Arystu2[1]= "Song";            Alert (arystu2[0]);                        for (Var i=0;i<arystr. length;i++) {                document.write (arystr[i]+ "<br  />")            }//Enhanced for: The loop variable holds the index for            (var i in arystr) {                document.write (arystr[i]+ " < BR /> ")            }

         var arystu=["Daniel Wu", "Edison Chen", "Peng"; Adds an element            Arystu.push ("Deng Chao") to the end of the array;            Printary (Arystu); //Delete the element at the end of the array            Arystu.pop ();            Printary (Arystu); //Start adding elements            to an array Arystu.unshift ("Luhan");            Printary (Arystu); //delete array start element            Arystu.shift ();            Printary (Arystu);

//Delete the element at the end of the array            Arystu.pop ();            Printary (Arystu); //Start adding elements            to an array Arystu.unshift ("* *");            Printary (Arystu); //delete array start element            Arystu.shift ();            Printary (Arystu);

//Link The elements of an array into a string            var str=arystu.join ();            alert (str); //array elements inverted            Arystu.reverse ();            Printary (Arystu);

Role:

1. Form Verification Focus
2. Dynamic Effect:

Which line the mouse moves to, which line is highlighted

Dynamically create, add, and delete label highlights

3. Parsing of JSON data

2) BOM Programming Browser object model, control the function of the browser:

1. How to get labels-focus

ID class name Tag hierarchy relationship

2. Change the style

Label object. style. style = "style value";

The label object. Classname= "class selector";

3. Dynamically create, add, delete tags

Dynamically create an LI tag

Dynamically creating row, column Table clone nodes

The assignment and value of the label:

Form Label: Label object. value= ""; --Assignment value                    :. Value (); Non-form Label: Label object. Innerhtml/innertext

1. Time function

var time=new Date (); Time.get               gets various attributes (month is 0-11, week is 0-6, 0 is Sunday)
SetInterval ("Get Time Function", milliseconds)      can call a function or evaluate an expression by a specified period (in milliseconds)

Javascript:dom, String, array, time