是否可以在将 iframe 插入 dom 之前在其 head 元素中创建一个带有脚本的 iframe,并在脚本onload="alert(1)"
准备好时触发它们?
示例 1,使用嵌套脚本:
var iframe = jQuery("<iframe></iframe>");
var scripts = '' +
'<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js" onload="alert(1);"><\/script>' +
'<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/chrome-frame/1.0.3/CFInstall.min.js" onload="alert(2);"><\/script>';
iframe.html(scripts);
jQuery("body").append(iframe);
示例二,更大:
function loadScript(path, callback, appendTo) {
var element = document.createElement('script');
element.setAttribute ("type", 'text/javascript');
element.setAttribute ("src", path);
return loadElement(element, callback, appendTo);
}
function loadElement(element, callback, appendTo) {
element.loaded = false;
if (element.readyState){ // IE
element.onreadystatechange = function(){
if (element.readyState == "loaded" || element.readyState == "complete"){
element.onreadystatechange = null;
loadElementOnLoad(element, callback);
}
};
} else { // Others
element.onload = function() {
loadElementOnLoad(element, callback);
};
}
(appendTo).appendChild(element);
return element;
}
function loadElementOnLoad(element, callback) {
if (element.loaded != true) {
element.loaded = true;
if ( callback ) callback(element);
}
}
function loadScriptNew1(src, callback, appendTo) {
loadScript(src, callback, appendTo)
}
var iframe = jQuery("<iframe></iframe>");
loadScriptNew1("http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js", function() {
alert(11)
}, iframe.get(0) )
loadScriptNew1("http://ajax.googleapis.com/ajax/libs/chrome-frame/1.0.3/CFInstall.min.js", function() {
alert(22)
}, iframe.get(0) )
jQuery("body").append(iframe)
这些方法都不会触发 onload 函数' alert
;
这可能吗?两种情况下都会加载脚本,因为它们的窗口对象已设置,但没有回调。