setTimeout 没有被调用(?)

问题描述

问题是我的数组是 [[][][]] 而不是 [[]] :/

The issue was my array was [[][][]] instead of [[]] : /

这是我的剧本

function loopobject(array) {
    var me = this;
    this.array = array;
    this.loop = function() {
        counter = 0;
        while(array.length > counter) {
            window[array[counter]]('arg1', 'arg2');
            counter++;
        }
        setTimeout(function(){ me.loop() }, 100);
    }
}

var loopinstant = new loopobject(array);
window.onload = loopinstant.loop();

问题出现在第一次迭代之后.我不知道到底是什么问题，但我想知道是不是因为它在一个对象内部，一旦函数被重新创建，它就不会记住数组?

The problem arises after the first iteration. I don't know exactly the problem but I'm wondering if its due to the fact this is inside an object, and once the function is recreated it doesn't remember the array?

推荐答案

不要将字符串传递给 setTimeout.

Don't pass a string to setTimeout.

将字符串传递给 setTimeout 会导致它在全局范围内被 eval ed.
除了不必要的缓慢之外，这意味着它不会看到您的局部变量，包括 loop 变量.

Passing a string to setTimeout causes it to be evaled in global scope.
In addition to being needlessly slow, that means that it won't see your local variables, including the loop variable.

相反，您应该将函数本身传递给 setTimeout:

Instead, you should pass a function itself to setTimeout:

setTimeout(function() { loop(array); }, 100);

此外，loopobject 实际上没有您可以稍后调用的 loop 属性.
要创建一个属性，请将其更改为 this.loop = function(...) { ... }.

Also, the loopobject doesn't actually have a loop property that you can call later.
To make a property, change it to this.loop = function(...) { ... }.

请注意，setTimeout 回调不会使用正确的 this 调用.
您还需要在局部变量中保存 this 的副本.

Note that the setTimeout callback won't be called with the correct this.
You'll also need to save a copy of this in a local variable.

最后，您的 window.onload 代码将调用 loop，然后将结果分配给 onload.

Finally, your window.onload code will call loop, then assign the result to onload.

纠正这些问题，你的代码就变成了

Correcting these issues, your code turns into

function loopobject(){
    var me = this;
    this.loop = function(array){
        counter = 0;
        while(array.length > counter){
            window[array[counter]]('arg1', 'arg2');
            counter++;
        }
        setTimeout(function() { me.loop(array); }, 100);
    };
}
var loopinstant = new loopobject();
window.onload = function() { loopinstant.loop(array); };

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