Javascript 在 Internet Explorer 中执行两次

Question

我目前遇到了一个问题，即延迟加载的 javascript 将使用 Internet Explorer 执行两次 - 并且仅 Internet Explorer（当前版本 9）。火狐和铬的作品。这是我的代码：

injectExternalJavaScript: function(fileUrl) {
    return jQuery.Deferred(function(deferred) {
        var script = document.createElement('script');
        script['src'] = fileUrl;
        script['type'] = 'text/javascript';
        var head = document.getElementsByTagName("head")[0];
        var done = false;
        // Attach handlers for all browsers
        script['onload'] = script['onreadystatechange'] = function() {
            if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === 'complete')) {
                done = true;
                script['onload'] = script['onreadystatechange'] = null;
                head.removeChild(script);
                deferred.resolve();
            }
        };
        head.appendChild(script);
    }).promise();
}

我已经找到this posting 并根据它更改了我的代码，但仍然执行我的脚本两次。你们有什么想法吗？

编辑：这是我的解决方案

injectExternalJavaScript: function(fileUrl) {
    return jQuery.Deferred(function(deferred) {
        var script = document.createElement('script');
        script['src'] = fileUrl;
        script['type'] = 'text/javascript';
        var head = document.getElementsByTagName("head")[0];
        var done = false;
        // Attach handlers for all browsers
        var cb = function() {
            if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === 'complete')) {
                done = true;
                script['onload'] = script['onreadystatechange'] = null;
                head.removeChild(script);
                deferred.resolve();
            }
        }
        if (script.addEventListener) {
            script.addEventListener('load', cb, false);
        } else {
            script['onreadystatechange'] = cb;
        }
        head.appendChild(script);
    }).promise();
}

Answer 1

试试这个

s = document.createElement("script");
s.src="myscript.js";
if(s.addEventListener) {
    s.addEventListener("load",callback,false);
}else if(s.readyState) {
    s.onreadystatechange = callback;
}
document.body.appendChild(s);
function callback() { console.log("loaded"); }

取自http://msdn.microsoft.com/en-us/library/ie/hh180173(v=vs.85).aspx

对你来说是……

injectExternalJavaScript: function(fileUrl) {
    return jQuery.Deferred(function(deferred) {
        var script = document.createElement('script');
        script['src'] = fileUrl;
        script['type'] = 'text/javascript';
        var head = document.getElementsByTagName("head")[0];
        var done = false;
        // Attach handlers for all browsers
        var cb = function() {
            if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === 'complete')) {
                done = true;
                script['onload'] = script['onreadystatechange'] = null;
                head.removeChild(script);
                deferred.resolve();
            }
        };
        if ( script.addEventListener ) {
            script.addEventListener('load',cb, false);
        } else {
            script.onreadystatechange = cb;
        }
        head.appendChild(script);
    }).promise();
}