Javascript setInterval 在 Google Chrome 扩展程序中不起作用(仅触发一次)
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setInterval not working (firing only once) in Google Chrome extension
提问by Camilo Martin
Just as the title says: setIntervalis only firing its callback once.
正如标题所说:setInterval只触发一次回调。
manifest.json:
清单.json:
{
    //...
    "content_scripts" : [{
        "js" : ["code.js"],
        //...
    }],
    //...
}
code.js (example):
code.js(示例):
setInterval(alert('only shown once'),2000);
Why, and how I could fix it? The code works well outside of an extension (even in a bookmarklet).
为什么,我该如何解决?该代码在扩展程序之外运行良好(即使在书签中)。
回答by qwertymk
setInterval(function() { alert('only shown once') },2000);
You need to pass a function reference like alertand not a return value alert()
您需要传递一个函数引用alert而不是返回值alert()
回答by Quentin
setIntervalisn't working at all.
setInterval根本不工作。
The first argument should be a function, you are passing it the return value of alert()which isn't a function.
第一个参数应该是一个函数,你传递给它的alert()不是函数的返回值。
Use the three argument version:
使用三个参数版本:
setInterval(function,time,array_of_arguments_to_call_function_with);
setInterval(alert,2000,['only shown once']);
回答by Dario
The way you wrote it it's wrong:
你写的方式是错误的:
setInterval()wants a function and a numerical value: setInterval(function(){//your code}, timeInterval).
setInterval()想要一个函数和一个数值:setInterval(function(){//your code}, timeInterval)。

