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JQuery is like $ ("# txtName "). addClass ("err" ).css ("font-size", "12px "). select (). the focus (); method is fascinating. The implementation mechanism is chained call. Chained call is to call the method of an object and return it to the object. Strictly speaking, it is not a syntax, but a syntax technique. The fascinating aspect of js is here.
The method without return values belongs to the assignment method. Obviously, it is easy to implement chained calling, provided that the usage of this pointer is correct.
Copy codeThe Code is as follows:
Function W (){
This. name = "Wang Hongjian ";
This. gender = "male ";
}
W. prototype. sayHi = function (){
Alert ("Hello, everybody \ nMy name is" + this. name );
Return this;
};
W. prototype. doSomething = function (){
Alert ("I'm working ");
Return this;
}
W. prototype. sayGoodbye = function (){
Alert ("Goodbye, everybody ");
Return this;
};
Var w = new W ();
W. sayHi (). doSomething (). sayGoodbye ();
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <ptml xmlns = "http://www.w3.org/1999/xhtml"> <pead> <meta http-equiv =" content-Type "content =" text/html; charset = gb2312 "/> <title> javascript chained call http://www.jb51.net/</title> </pead> <body> </ptml>
[Ctrl + A select all Note: If you need to introduce external Js, You need to refresh it to execute]
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