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83 lines
2.4 KiB
83 lines
2.4 KiB
// 阻止拖动看到“powered by...”
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// 查看el是否存在selector对应的父dom
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function closest(el, selector) {
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var matchesFn;
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// find vendor prefix
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['matches','webkitMatchesSelector','mozMatchesSelector','msMatchesSelector','oMatchesSelector'].some(function(fn) {
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if (typeof document.body[fn] == 'function') {
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matchesFn = fn;
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return true;
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}
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return false;
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})
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var parent;
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// traverse parents
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while (el) {
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parent = el.parentElement;
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if (parent && parent[matchesFn](selector)) {
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return parent;
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}
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el = parent;
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}
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return null;
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}
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var _startX = 0,
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_startY = 0,
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_currentSelector;
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function _touchStart(e) {
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if (e.target.className === 'active-state' || closest(e.target, '#eruda')) {
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return;
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}
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if (!closest(e.target, _currentSelector)) {
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// console.log('非需要拖拽的区域')
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e.preventDefault()
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return;
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}
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try {
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var touch = e.touches[0],
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x = Number(touch.pageX),
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y = Number(touch.pageY);
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_startX = x;
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_startY = y;
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} catch (e) {
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alert(e);
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}
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}
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// document.addEventListener('touchstart', _touchStart);
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function initScrollDom(selector) {
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return;
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_currentSelector = selector
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var ele = document.querySelector(selector);
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// ele.ontouchmove
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var _touchMove = function (e) {
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var point = e.touches[0],
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eleTop = ele.scrollTop,
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eleScrollHeight = ele.scrollHeight,
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eleOffsetHeight = ele.offsetHeight,
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eleTouchBottom = eleScrollHeight - eleOffsetHeight;
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// console.log('----------------------------')
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// console.log(eleTop)
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// console.log(eleTouchBottom)
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// console.log(point.clientY)
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// console.log(_startY)
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// console.log('----------------------------')
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if (eleTop === 0) {
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if (point.clientY > _startY) {
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e.preventDefault();
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}
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} else if (eleTop === eleTouchBottom) {
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if (point.clientY < _startY) {
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e.preventDefault()
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}
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}
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};
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ele.removeEventListener('touchmove', _touchMove);
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ele.addEventListener('touchmove', _touchMove);
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} |