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JavaScript's String native method

Source: Internet
Author: User
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    • Join ([delimiter]) array elements are combined as strings
    • ToString () represents the array as a string
    • Reverse () array inversion--change the original array itself
    • ValueOf () returns the array value
<HTML> <Head> <Scripttype= "Text/javascript"> varFruits= ["Apple","Pear","Orange"];//It is recommended to define and initialize the array with(document) {Writeln ("<ul>"); Writeln ("<li>"+Fruits.join ()+"</li>"); Writeln ("<li>"+Fruits.join ("--")+"</li>"); Writeln ("<li>"+Fruits.reverse (). Join ()+"</li>"); Writeln ("<li>"+fruits.valueof ()+"</li>"); Writeln ("</ul>"); }</Script> </Head> </HTML>
    • toUpperCase ()--Variable capitalization
    • charAt (Index)--refers to a character
    • substring (begin,len)--truncated string
<HTML> <Head> <Scripttype= "Text/javascript"> varStr="JavaScript"; varNum=1234; with(document) {Writeln (Str.touppercase ()+"<br>"); Writeln (Num.tostring (). CharAt (3)+"<br>"); Writeln (Str.substring (0,4)+"<br>"); } </Script> </Head> </HTML>

Operation Result:

Javascript
3
Java

    • indexof--determine if a character exists in a string
<HTML> <Head> <Scripttype= "Text/javascript"> functionIsemail () {varEmailvalue=Document.getelementsbyname ("Email")[0].value; if(Emailvalue.indexof ("@")==-1) {alert ("Please enter the correct email"); }Else{alert ("OK"); } } </Script> </Head> <Body> <inputtype= "text"name= "Email"     > <inputtype= "button"value= "Check"onclick= "Isemail ();"></Body> </HTML>

JavaScript's String native method

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