<!doctype html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<div class="scroll" style="position:absolute; overflow:scroll; -webkit-overflow-scrolling: touch; top:0; left:0; bottom:0; right:0">
</div>
</body>
<script>
var overscroll = function(el) {
el.addEventListener('touchstart', function() {
var top = el.scrollTop
, totalScroll = el.scrollHeight
, currentScroll = top + el.offsetHeight
//If we're at the top or the bottom of the containers
//scroll, push up or down one pixel.
//
//this prevents the scroll from "passing through" to
//the body.
if(top === 0) {
el.scrollTop = 1
} else if(currentScroll === totalScroll) {
el.scrollTop = top - 1
}
})
el.addEventListener('touchmove', function(evt) {
//if the content is actually scrollable, i.e. the content is long enough
//that scrolling can occur
if(el.offsetHeight < el.scrollHeight)
evt._isScroller = true
})
}
overscroll(document.querySelector('.scroll'));
document.body.addEventListener('touchmove', function(evt) {
//In this case, the default behavior is scrolling the body, which
//would result in an overflow. Since we don't want that, we preventDefault.
if(!evt._isScroller) {
evt.preventDefault()
}
}, {passive: false})
//passive: false 兼容ios
</script>
</html>
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