Javascript setTimeout是否会停止其他脚本执行 [英] Does Javascript setTimeout stop other script execution

问题描述

我指的是这个。一切都还不清楚。

I am referring to this. Everything is still not clear.

• 我有一个JS函数 fillTree（）哪个更新树，它有复选框。


• 我有另一个函数 checkSelectedBoxes（）在窗口上执行.onload 检查选中的复选框。


• 现在连接了很多其他功能。

• I have a JS function fillTree() which updates a tree, it has checkboxes.
• I have another function checkSelectedBoxes() which is executed on window.onload which checks for selected checkboxes.
• Now there are lots of other functions connected.

我的问题：

• 如果我使用 setTimeout（）其他脚本函数是否也会停止并等待我的函数完成加载？

• If I am using setTimeout() will the other script function also stop and wait for my function to finish loading?

这可能是这种情况：

function fillTree(){...}
function checkSelectedBoxes(){...}

fillTree(); // This take time to get data. onLoad() doesnt work.
setTimeout(function(){ checkSelectedBoxes()  },5000);

即使在增加时间间隔后，这也会返回空值。 fillTree（）暂停执行吗？

This returns me null values even after increasing the time interval. Does fillTree() pause execution?

推荐答案

不， setTimeout 不等你（因此，JS没有暂停功能）。什么 setTimeout 确实在以后留出该任务，并允许执行下一行。当超时达到时，它会将该任务插入执行行。当没有其他代码正在运行时，它会执行指示的函数。

No, setTimeout does not wait for you (hence, JS has no pause function). What setTimeout does is set aside that task at a later time, and allow the next line to be executed. when that timeout is reached , it inserts that task into the execution line. and when no other code is running, it executes the function that was indicated.

你想要做的是回复你的 fillTree（）并在完成后执行。

what you want to do is give a callback to your fillTree() and execute when it's done.

function fillTree(callback){

    //do something very long

    callback(); //execute passed function when it's done
}

fillTree(function(){
    checkSelectedBoxes(); //executes only when fillTree finishes
})

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