如果第三方javascript文件挂起并需要一段时间加载,将会
jQuery(document).ready(function() {})
在被叫之前必须等待加载？
And*_*ass 13
是的,它必须等待.特别是,jQuery(document).ready()在其他脚本有机会执行之前,您不能依赖于触发.
ready绑定到DOMContentReady,readystatechanged或onload,无论哪个可用.
该文档指出"在大多数情况下,脚本可以在DOM层次结构完全构建后立即运行".请注意,唯一的保证是在此事件触发时DOM已准备就绪. 它不能保证你的任何其他东西 - 因为它不能.
这一点,例如不会在IE,Firefox或铬工作,brilliant.js是一直呼吁的前ready()处理程序有机会执行不管你怎么洗牌脚本标记:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Test</title>
<script src="http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.2.js" charset="utf-8" type="text/javascript" ></script>
</head>
<body>
<script type="text/javascript" >
// <![CDATA[
alert("attaching event");
$(document).ready(function () { alert("fired"); });
// ]]>
</script>
<script type="text/javascript" src="brilliant.js" ></script>
</body>
</html>
仅供参考,这是jquery-1.4.2的相关代码:
bindReady: function() {
if ( readyBound ) {
return;
}
readyBound = true;
// Catch cases where $(document).ready() is called after the
// browser event has already occurred.
if ( document.readyState === "complete" ) {
return jQuery.ready();
}
// Mozilla, Opera and webkit nightlies currently support this event
if ( document.addEventListener ) {
// Use the handy event callback
document.addEventListener( "DOMContentLoaded", DOMContentLoaded, false );
// A fallback to window.onload, that will always work
window.addEventListener( "load", jQuery.ready, false );
// If IE event model is used
} else if ( document.attachEvent ) {
// ensure firing before onload,
// maybe late but safe also for iframes
document.attachEvent("onreadystatechange", DOMContentLoaded);
// A fallback to window.onload, that will always work
window.attachEvent( "onload", jQuery.ready );
// If IE and not a frame
// continually check to see if the document is ready
var toplevel = false;
try {
toplevel = window.frameElement == null;
} catch(e) {}
if ( document.documentElement.doScroll && toplevel ) {
doScrollCheck();
}
}
},
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