通过fastclick源码分析彻底解决tap“点透”(8)

         this.cancelNextClick = true;
         return true;
     }
     this.lastClickTime = event.timeStamp;
     trackingClickStart = this.trackingClickStart;
     this.trackingClick = false;
     this.trackingClickStart = 0;
     if (this.deviceIsIOSWithBadTarget) {
         touch = event.changedTouches[0];
         targetElement = document.elementFromPoint(touch.pageX - window.pageXOffset, touch.pageY - window.pageYOffset) || targetElement;
         targetElement.fastClickScrollParent = this.targetElement.fastClickScrollParent;
     }
     targetTagName = targetElement.tagName.toLowerCase();
     if (targetTagName === 'label') {
         forElement = this.findControl(targetElement);
         if (forElement) {
             this.focus(targetElement);
             if (this.deviceIsAndroid) {
                 return false;
             }
             targetElement = forElement;
         }
     } else if (this.needsFocus(targetElement)) {
         if ((event.timeStamp - trackingClickStart) > 100 || (this.deviceIsIOS && window.top !== window && targetTagName === 'input')) {
             this.targetElement = null;
             return false;
         }
         this.focus(targetElement);
         if (!this.deviceIsIOS4 || targetTagName !== 'select') {
             this.targetElement = null;
             event.preventDefault();
         }
         return false;
     }
     if (this.deviceIsIOS && !this.deviceIsIOS4) {
         scrollParent = targetElement.fastClickScrollParent;