iScroll 4 - 取消preventDefault（）

Question

在下面的代碼中，我添加了三個應該解釋問題的註釋。總之：我想知道如何在已經設置時禁用e.preventDefault();？

var startY; 
    myScroll = new iScroll(DOMElement, { 
     snap: 'li', 
     bounce: false, 
     bounceLock: false, 
     momentum: false, 
     hScrollbar: false, 
     vScrollbar: false, 
     hScroll: true, 
     vScroll: false, 
     wheelAction: 'scroll', 
     onBeforeScrollStart: function(e){ 
      startY = e.pageY; 
      // By default it's advisable to disable browser's scroll 
      e.preventDefault(); 
     }, 
     onScrollStart: function(){ }, 
     onScrollMove: function(e){ 
      // But here I want to enable browser's functionality if user 
      // explicitly demands this (i.e. tries to scroll vertically) 
      if(startY >= e.pageY+70 || startY <= e.pageY-70){ 
       console.log('test'); 
       //alert('test'); 
       console.log(e); 
       // However, I don't know how to restore this functionality 
       // Touch device detects 'test' alert correctly and this is 
       // where I'm stuck. 
      } 
     }, 
     onScrollEnd: function(){ }, 
     onRefresh: function(){ }, 
     onDestroy: function(){ }, 
    }); 

任何幫助將不勝感激！

Answer 1

您可以控制滾動onBeforeScrollStart。防止在特定區域之間滾動。如果超過，則開始滾動。我認爲這有助於：

var startY; 
var isStarted = false; 
myScroll = new iScroll(DOMElement, { 
    snap: 'li', 
    bounce: false, 
    bounceLock: false, 
    momentum: false, 
    hScrollbar: false, 
    vScrollbar: false, 
    hScroll: true, 
    vScroll: false, 
    wheelAction: 'scroll', 
    onBeforeScrollStart: function(e){ 
     var y=e.pageY; 
     if (!isStarted) { 
      startY = y + 0; 
      isStarted = true; 
     } 

     if(startY < y+70 || startY > y-70){ 
      e.preventDefault(); 
     } 
    }, 
    onScrollStart: function(){ }, 
    onScrollMove: function(e){ }, 
    onScrollEnd: function(){ 
     isStarted = false; 
    }, 
    onRefresh: function(){ }, 
    onDestroy: function(){ }, 
});