我如何更改“this"的范围?在 setInterval 和 setTimeout 函数中 [英] How do I change scope of "this" in setInterval and setTimeout functions

问题描述

如何在 setInterval 和 setTimeout 调用中使用 this ?

How is it possible to use this inside of setInterval and setTimeout calls?

我想像这样使用它:

function myObj() {
  this.func = function(args) {
    setTimeout(function() { 
      this.func(args);
    }, 1000);
  }
}

前段时间我是这样为 .onclick 事件做的:

Some time ago I did it for .onclick event this way :

this.click = function(func) {
  this.elem.onclick = (function(func, obj) {return function(){func.apply(obj)} })(func,this);
};

但我不知道如何为 intervals 和 timeouts 做到这一点.

but I don't know how I can do it for intervals and timeouts.

推荐答案

最简单的方法是将 this 保存到本地.本地 self 不会被调用 setInterval 和 setTimeout 回调的上下文改变.它将改为保持原始的 this 值

The easiest way is to just save this into a local. The local self isn't changed by the context in which setInterval and setTimeout callbacks are invoked. It will instead maintain the original this value

function myObj() {
  var self = this;
  this.func = function(args) {
    setTimeout(function() { 
      self.func(args);
    }, 1000);
  }
}

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