Chrome中的窗口onload事件失败 [英] window onload event fails in Chrome

问题描述

我正在从javascript中添加一些<script/>标记以加载某些库(例如jquery).加载所有库后，我将执行主代码.为了等到一切就绪，我使用类似于此答案中的解决方案(在网络上找到).

I'm adding some <script/> tags from javascript to load some libraries (e.g., jquery). When all libraries are loaded, I execute main code. To wait until everything's ready, I use solution similar to the one in this answer (found it on the web).

现在，故事: http://jsfiddle.net/EH84z/

function load_javascript(src) {
    var a = document.createElement('script');
    a.type = 'text/javascript';
    a.src = src;
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(a, s);
}

load_javascript('http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js');

function addEvent(elm, evType, fn, useCapture) {
    //Credit: Function written by Scott Andrews
    //(slightly modified)
    var ret = 0;

    if (elm.addEventListener) {
        ret = elm.addEventListener(evType, fn, useCapture);
    } else if (elm.attachEvent) {
        ret = elm.attachEvent('on' + evType, fn);
    } else {
        elm['on' + evType] = fn;
    }

    return ret;
}

addEvent(window, "load", function() {
    console.log(window.jQuery + '  ' + window.$);
    $(document);
}, false);

它在Firefox中运行良好，但在Chrome中经常失败.每当我第二次按下jsfiddle的运行"按钮时，就会在加载JQuery之前执行回调，从而在Chrome控制台中出现错误.

It works fine in Firefox, but quite often fails in Chrome. Every second time I press jsfiddle 'run' button, callback is executed before JQuery is loaded, thus giving error in Chrome console.

这是否意味着我严重滥用addEventListener?如果是，它的正确用法是什么?如何真的等到所有脚本加载完毕?

Does it mean I misuse addEventListener horribly? If yes, what's the correct use for it and how do I really wait until all scripts are loaded?

谢谢！
PS尚未在任何其他浏览器中对其进行测试，因此，如果它在其他地方失败，请发表评论.

Thanks!
PS Didn't test it in any other browsers yet, so please comment if it's failing somewhere else.

修改
如果在测试之前等待一秒钟(使用setTimout)，则成功率将提高到100％.示例 http://jsfiddle.net/EH84z/1/

edit
if I wait one second (using setTimout) before testing, success rate increases to 100%. An example http://jsfiddle.net/EH84z/1/

推荐答案

您必须将load事件附加到jQuery脚本标签，而不是window对象.

You have to attach the load event to the jQuery script tag, not the window object.

尝试一下:

function load_javascript(src) {
    var a = document.createElement('script');
    a.type = 'text/javascript';
    a.src = src;
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(a, s);

    // attach it to the script tag
    addEvent(a, "load", function() {
        console.log(window.jQuery + '  ' + window.$);
        $(document);
    }, false);
}

这篇关于Chrome中的窗口onload事件失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！