奇怪的随机值作为默认间隔处理程序参数

发布于 2024-08-18 05:40:08 字数 814 浏览 7 评论 0原文

刚刚遇到这个。它并没有真正影响任何事情，但我想知道为什么会发生这种情况。

如果我在带有 firebug 的 Firefox 中运行以下代码：

setInterval(function(param) 
     {
        console.log("param is %o",param)
     },500);

param 似乎被分配了一个模糊的随机值：

   param is -2
    param is -1
    param is -2
    param is 1
    param is -1
    param is 6
    param is -1
    param is 0
    param is -2
    param is 2
    param is 0
    param is 2
    param is 0
    param is 0
    param is 0
[..]
    param is 0
    param is 0
    param is 0
    param is 0
    param is 0
    param is 0
    param is 0
    param is 911
    param is 0
    param is 0
    param is 0
    param is -1

我确实很感激我没有将任何参数传递给 setInterval 来传递给函数，但是为什么 javascript 选择传递这个随机数？

我本来期望未定义或类似的东西......

干杯

p.s.没有在其他浏览器中测试过

原文

Just came across this. It's not affecting anything really but i'm wondering why it's happening.

If I run the following code in firefox with firebug on:

setInterval(function(param) 
     {
        console.log("param is %o",param)
     },500);

param seems to be assigned a vaguely random value:

   param is -2
    param is -1
    param is -2
    param is 1
    param is -1
    param is 6
    param is -1
    param is 0
    param is -2
    param is 2
    param is 0
    param is 2
    param is 0
    param is 0
    param is 0
[..]
    param is 0
    param is 0
    param is 0
    param is 0
    param is 0
    param is 0
    param is 0
    param is 911
    param is 0
    param is 0
    param is 0
    param is -1

I do appreciate that I'm not passing any argument to setInterval to pass on to the function, but why does javascript chooses to pass this random number ?

I would have expected undefined or something like that...

Cheers

p.s. Haven't tested in other browsers

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调妓 2024-08-25 05:40:08

它似乎取决于 Firefox 的 CPU 使用率。

我猜想这是从应该调用回调的时间开始的延迟。

编辑：我是对的。这是调用回调的延迟毫秒数。

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落在眉间の轻吻 2024-08-25 05:40:08

它是由window.setInterval自动设置的间隔ID。如果存储结果，则可以稍后清除间隔（以停止它），

var intID = window.setInterval( function(){ alert("I'm annoying!"); }, 10000 );

// this will kill it before it annoys you, :D
window.clearInterval( intID );

window.setTimeout 也是如此：

var timeID = window.setTimeout( function(){ alert("I'm annoying!"); }, 10000 );

// this will kill it before it annoys you, :D
window.clearTimeout( timeID );

it's an interval ID automatically set by window.setInterval. if you store the result, you can clear the interval later (to stop it)

var intID = window.setInterval( function(){ alert("I'm annoying!"); }, 10000 );

// this will kill it before it annoys you, :D
window.clearInterval( intID );

this is also the case with window.setTimeout:

var timeID = window.setTimeout( function(){ alert("I'm annoying!"); }, 10000 );

// this will kill it before it annoys you, :D
window.clearTimeout( timeID );

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