JavaScript setTimeout（）不会等待执行？ [英] JavaScript setTimeout() won't wait to Execute?

问题描述

考虑以下示例：

<script type="text/javascript">
    function alertBox(){
        alert('Hello World!');
    }
    function doSomething(){
        setInterval(alertBox(), 5000); //This is for generic purposes only
    };
    function myFunction(){
        setTimeout(doSomething(),3000);
    };

    myFunction();
</script>

是什么导致它执行 IMMEDIATELY ，而不是等待3秒设置，而不是仅执行警告 ONCE ，而不是按预定的5秒间隔？

What is it that causes this to execute IMMEDIATELY, rather than waiting the 3 seconds set, as well as only executing the alert ONCE, rather than at the scheduled 5 second intervals?

感谢您提供的任何帮助！

Thanks for any help you can provide!

Mason

推荐答案

alertBox()

Doesn'这看起来像一个立即函数调用？

Doesn't this look like an immediate function call?

尝试传递函数（不执行它）：

Try passing the function (without executing it) instead:

setInterval(alertBox, 5000);

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