jquery中ready()函数执行的时机和window的load事件比较

// 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" );            }        }    },