当作为参数传递给 setTimeout 回调函数时，全局变量被记录为未定义 [英] Global variable is logged as undefined when passed as parameter to setTimeout callback function

问题描述

我有一些JS代码如下:

var x = self.someAJAXResponseJSON;//x 在这里有一些对象值.设置超时(函数(x){console.log("In setTimeout:", x);//但是这里 x 是未定义的}, 1000);

所以我想将 x 传递给 setTimeout 回调函数.但是我在 setTimeout 中将 x 设为未定义.

我做错了什么?

知道如何使用 Dojo.js 解决类似问题吗?

setTimeout(dojo.hitch(this, function(){this.executeSomeFunction(x);//这应该是什么?console.log("In setTimeout:", x);//但是这里 x 是未定义的}), 1000);

解决方案

或者，您可以在不创建闭包的情况下完成.

function myFunction(str1, str2) {警报(str1)；//你好警报(str2)；//世界}window.setTimeout(myFunction, 10, 'hello', 'world');

但请注意它不适用于 IE <10 根据 MDN.>

I have some JS code as below:

var x = self.someAJAXResponseJSON; // x has some object value here.

setTimeout(function(x){
  console.log("In setTimeout:", x); // But x is undefined here
}, 1000);

So I want to pass x to the setTimeout callback function. But I am getting x as undefined inside the setTimeout.

What am I doing wrong?

Any idea how to fix a similar issue using Dojo.js?

setTimeout(dojo.hitch(this, function(){
  this.executeSomeFunction(x); // What should this be?
  console.log("In setTimeout:", x); // But x is undefined here
}), 1000);

解决方案

Alternatively you can do it without creating a closure.

function myFunction(str1, str2) {
  alert(str1); //hello
  alert(str2); //world
}

window.setTimeout(myFunction, 10, 'hello', 'world');

But note it doesn't work on IE < 10 according to MDN.

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