jQuery-jquery中ready()函数执行的时机和window的load事件一样么？

Answer 1

jquery的ready()实现的是 DOMContentLoaded 事件.

Answer 2

简单的说jquery.ready方法是在页面html下载完毕后触发的，window.onload是在页面被渲染完毕后出发的。

Answer 3

不一样, ready()是在文档加载完成就会触发,此时图片等资源可能还没有完全加载, load是在所有资源都加载完成后才会触发

Answer 4

看下ready函数的代码就什么都清楚了。下面的代码加上了注释：

// Handle when the DOM is ready
ready: function() {
// Make sure that the DOM is not already loaded
if ( !jQuery.isReady ) {
// Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443).
if ( !document.body ) {
return setTimeout( jQuery.ready, 13 );
}

// Remember that the DOM is ready
jQuery.isReady = true;

// If there are functions bound, to execute
if ( readyList ) {
// Execute all of them
var fn, i = 0;
while ( (fn = readyList[ i++ ]) ) {
fn.call( document, jQuery );
}

// Reset the list of functions
readyList = null;
}

// Trigger any bound ready events
if ( jQuery.fn.triggerHandler ) {
jQuery( document ).triggerHandler( "ready" );
}
}
},