问题描述

最近在使用jquery模拟a标签的click事件，无法触发其默认行为。即click()或trigger('click')无法触发href跳转。

<a id="aBtn" href="https:///"> <span id="spanBtn">去卡咪官网</span></a>$('#spanBtn').click();//或者$('#spanBtn').trigger('click');

jquery trigger()实现源码(8159行-8304行)

源码链接地址

关键摘要：

// Fire handlers on the event path （8237行）i = 0;while ( ( cur = eventPath[ i++ ] ) && !event.isPropagationStopped() ) { lastElement = cur; event.type = i > 1 ? bubbleType : special.bindType || type; // jQuery handler handle = ( dataPriv.get( cur, "events" ) || {} )[ event.type ] && dataPriv.get( cur, "handle" ); if ( handle ) { //******自身trigger('click')或click()时,会调用缓存列表里的事件回调函数,但未执行elem.click()****** handle.apply( cur, data ); } // Native handler handle = ontype && cur[ ontype ]; if ( handle && handle.apply && acceptData( cur ) ) { event.result = handle.apply( cur, data ); if ( event.result === false ) { event.preventDefault(); } }}// If nobody prevented the default action, do it now （8263行）if ( !onlyHandlers && !event.isDefaultPrevented() ) { if ( ( !special._default || special._default.apply( eventPath.pop(), data ) === false ) && acceptData( elem ) ) { // Call a native DOM method on the target with the same name as the event. // Don't do default actions on window, that's where global variables be (#6170) if ( ontype && isFunction( elem[ type ] ) && !isWindow( elem ) ) { // Don't re-trigger an onFOO event when we call its FOO() method tmp = elem[ ontype ]; if ( tmp ) { elem[ ontype ] = null; } // Prevent re-triggering of the same event, since we already bubbled it above jQuery.event.triggered = type; if ( event.isPropagationStopped() ) { lastElement.addEventListener( type, stopPropagationCallback ); } //******子元素trigger('click')或click()，会执行elem.click()****** elem[ type ](); if ( event.isPropagationStopped() ) { lastElement.removeEventListener( type, stopPropagationCallback ); } jQuery.event.triggered = undefined; if ( tmp ) { elem[ ontype ] = tmp; } } }}

总结

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