handlers:
function( event, handlers ) {
var sel, handleObj, matches, i,
handlerQueue = [],
delegateCount = handlers.delegateCount,
cur = event.target;
//绑定委托事件的元素
// Find delegate handlers
// Black-hole SVG <use> instance trees (#13180)
// Avoid non-left-click bubbling in Firefox (#3861)
//委托事件过滤,符合条件的事件才会被加入事件队列中
if ( delegateCount && cur.nodeType && (!event.button || event.type !== "click") ) {
/* jshint eqeqeq: false */
for ( ; cur !=
this; cur = cur.parentNode ||
this ) {
/* jshint eqeqeq: true */
// Don‘t check non-elements (#13208)
// Don‘t process clicks on disabled elements (#6911, #8165, #11382, #11764)
/*
nodeTyp:
元素element 1
属性attr 2
文本text 3
注释comments 8
文档document 9
* */
if ( cur.nodeType === 1 && (cur.disabled !==
true || event.type !== "click") ) {
matches = [];
for ( i = 0; i < delegateCount; i++ ) {
handleObj = handlers[ i ];
// Don‘t conflict with Object.prototype properties (#13203)
sel = handleObj.selector + " ";
if ( matches[ sel ] === undefined ) {
matches[ sel ] = handleObj.needsContext ?
jQuery( sel,
this ).index( cur ) >= 0 :
jQuery.find( sel,
this,
null, [ cur ] ).length;
//判断【当前元素】是否是【绑定委托事件元素】的子元素
}
if ( matches[ sel ] ) {
matches.push( handleObj );
}
}
if ( matches.length ) {
handlerQueue.push({ elem: cur, handlers: matches });
//将符合条件的事件加入事件队列中
}
}
}
}
//将非委托事件加入事件队列
if ( delegateCount < handlers.length ) {
handlerQueue.push({ elem:
this, handlers: handlers.slice( delegateCount ) });
}
return handlerQueue;
}
