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touchend时，是不是应该用changedTouches访问当前触摸点对象 #104

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narol1024 opened this issue Mar 18, 2018 · 3 comments
Open

touchend时，是不是应该用changedTouches访问当前触摸点对象 #104

narol1024 opened this issue Mar 18, 2018 · 3 comments

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@narol1024
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narol1024 commented Mar 18, 2018 •
edited

AlloyFinger/react/AlloyFinger.jsx

Line 167 in 9d0db8e

if (evt.touches.length<2) {

貌似touchend触发后，只有event.changedTouches才能访问到触摸点对象，targetTouches和touches此时为空了。

另外为什么判断length < 2时才触发onMultipointEnd，不解，或者说，怎么样判断是单点触发end还是多点触发end事件？
@narol1024 narol1024 changed the title touchend时，是不是应该用changeTouches访问当前触摸点对象 touchend时，是不是应该用changedTouches访问当前触摸点对象 Mar 18, 2018
@dntzhang
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touches 可以访问到还遗留在屏幕上的 触点啊~~

@narol1024
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narol1024 commented Mar 19, 2018 •
edited

假设是多触摸点的话，同时松开，那么touches在touchend应该为空了，changedTouches则不会

@narol1024
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narol1024 commented Mar 19, 2018 •
edited

现在比较尴尬的事，单点触摸也会触发multipointEnd事件，同这个issue

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@dntzhang @narol1024