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Javascript&jquery.this keywords

Source: Internet
Author: User
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this keyword

The This keyword is typically used inside a function or inside an object.

The location of a function or method declaration affects the meaning of the This keyword.

Typically, this points to the object that the current function is manipulating.

<!DOCTYPE html>

< html lang = "en" > < head >      < meta charset = "UTF-8" >      < title >this关键字</ title > </ head > < body > < script >      window.onload=function (ev) {          // 调用对象          this.person.eat();      }       var person={};//字面量创建对象       // 设置字面量对象属性      person.name=‘huangshiren‘;      person.age=58;      person.appetite=3;      person.eat=function(){          var value=this.name+‘的饭量是‘+this.appetite;          document.write(value+‘< br >‘);          document.write(‘正在吃饭‘);      } </ script > </ body > </ html >Test Questions

1, how to determine the point of this keyword?

For:

    • Fun () is a global function, while the declared fun receives a simple function in obj, and does not call (Obj.say () is called function), at this time the fun is a function (function () {alert (THIS.STR);} ), then when the fun () Call function, this point is the window
    • Who is calling the function, then this is pointing to WHO

2. Do you want to use this keyword?

Answer: No

Javascript&jquery.this keywords

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