clearInterval不会clearInterval [英] clearInterval doesn't clearInterval

问题描述

  var定时器；函数check_element_load(){计时器= window.setInterval(function(){console.log(仍在工作");//永远运行if(document.getElementById("comments")){console.log("FOUND");//这实际上运行document.getElementsByTagName("fb:comments")[0] .setAttribute('order_by'，'social');window.clearInterval(timer);//<没有效果}}，50);}check_element_load(); 

我正在尝试在脚本上方放置一个脚本，以检查特定元素是否已成功加载到浏览器中，它可以正常工作(控制台登录"FOUND")，但是当我编写另一个脚本时控制台日志，以查看间隔是否仍在运行.确实如此，它永远不会停止并且 clearInterval 被完全忽略

有什么我想念的吗?我还尝试过使用其他所有解决方案，包括 settimeout ，现在最接近我的是书面解决方案，我只想让 clearinterval 在条件返回true后生效.

是否有任何类似于 clearinterval 的方法更有效，杀死了整个函数或其他功能?

解决方案

就目前而言，您的代码是正确的，但是

  document.getElementsByTagName("fb:comments")[0] .setAttribute('order_by'，'social'); 

引发错误，(当然)超时将永远不会清除.您可以改为使用 SetTimeout .

最有可能调用 getElementsByTagName("fb:comments")返回一个空集，给您未定义的元素上不存在方法setAttribute"类型错误.

var timer;

function check_element_load(){
    timer = window.setInterval(function(){
        console.log("still working"); // keeps running forever
        if(document.getElementById("comments")){
            console.log("FOUND"); // this actually runs
            document.getElementsByTagName("fb:comments")[0].setAttribute('order_by', 'social');
            window.clearInterval(timer); // < not effective
        }
    }, 50);
}


check_element_load();

I'm trying to put a script on top to keep checking if a specific element was successfully loaded in the browser, it works (the console logged " FOUND "), but when I wrote another console log to see if the interval still running. it does, it never stops and the clearInterval is completely ignored

is there anything that I missed ? I also tried using all other solutions including settimeout and the closest one to me now is the written, I just want the clearinterval to take effect after the condition returns true.

Is there anything similar to clearinterval that is more effective, kills the whole function or something?

解决方案

As it stands, your code is logical correct, however if

document.getElementsByTagName("fb:comments")[0].setAttribute('order_by', 'social');

throws an error, (of course) the timeout will never be cleared. You could use SetTimeout instead.

Most likely calling getElementsByTagName("fb:comments") returns an empty set, giving you an "method setAttribute does not exist on Element undefined" Type Error.

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