Programmer Think

this this is a keyword of JavaScript language. It is an object automatically generated inside the function body when the function is running. It can only be used inside the function body. function test() { this.x = 1; } Multiple directions of this: In JavaScript, this is not fixed. It will change with the change of execution environmen ...

Formally speaking, these three methods can hijack the methods of another object and inherit the properties of another object. Generally speaking, it can change the direction of this. 1,apply 1. Basic use Syntax: apply(T,A) T: Change the direction of this A: Passed parameter, array type Specific demonstration: window.name = 'window' ...

We all know the direction of this: Always adhere to a principle: this always points to the object that was invoked at last, because the object of calling function is different, which leads to the different direction of this. However, the direction of this can be changed by using call apply bind: call method Syntax: fun call(thisArg, arg1, ...