优化iscroll在ios webview顶部滑出不触发滑动结束事件

ipuui/demo/dep/js/iscroll/iscroll.js

@@ -1,6 +1,7 @@
/*!
 * iScroll v4.2.5 ~ Copyright (c) 2012 Matteo Spinelli, http://cubiq.org
 * Released under MIT license, http://cubiq.org/license
 * 非官方原始版本，已优化处理
 */
(function (window, doc) {
  var m = Math,
@@ -35,6 +36,10 @@
    isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
    isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),
  // add by ipu 判断是否webview环境
    ua = navigator.userAgent,
    webApp = ua.indexOf('Safari') == -1,  //是否web应该程序，没有头部与底部
    has3d = prefixStyle('perspective') in dummyStyle,
    hasTouch = 'ontouchstart' in window && !isTouchPad,
    hasTransform = vendor !== false,
@@ -97,8 +102,8 @@
      // Default options
      that.options = {
        hScroll: true,
        vScroll: true,
        hScroll: true,    // 纵向滚动
        vScroll: true,    // 垂直滚动
        x: 0,
        y: 0,
        bounce: true,
@@ -112,8 +117,8 @@
        handleClick: false,
        // Scrollbar
        hScrollbar: true,
        vScrollbar: true,
        hScrollbar: true,   // 是否显示纵向滚动条
        vScrollbar: true,   // 是否显示垂直滚动条
        fixedScrollbar: isAndroid,
        hideScrollbar: isIDevice,
        fadeScrollbar: isIDevice && has3d,
@@ -156,8 +161,8 @@
      for (i in options) that.options[i] = options[i];
      // Set starting position
      that.x = that.options.x;
      that.y = that.options.y;
      that.x = that.options.x;      // 初始位置
      that.y = that.options.y;      // 初始位置
      // Normalize options
      that.options.useTransform = hasTransform && that.options.useTransform;
@@ -445,6 +450,20 @@
        c1, c2, scale,
        timestamp = e.timeStamp || Date.now();
      // add by ipu，
      // ios webview环境：往上滑动到达顶部工具栏后，不触发touchend，需手动触发touchend
      // 参考：https://segmentfault.com/q/1010000002943205
      // 判断为ios webview环境，且超出webview窗口范围
      if (!isAndroid && webApp && e.changedTouches[0].pageY <= 0) {
        e.preventDefault();
        that._unbind("touchmove", window);
        var cancelEvent = new Event(CANCEL_EV);
        cancelEvent.touches = [];
        cancelEvent.changedTouches = e.changedTouches;
        window.dispatchEvent(cancelEvent);
        return;
      }
      if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);
      // Zoom
@@ -895,11 +914,11 @@
    },
    _bind: function (type, el, bubble) {
      (el || this.scroller).addEventListener(type, this, {capture:!!bubble, passive: false});
      (el || this.scroller).addEventListener(type, this, {capture: !!bubble, passive: false});
    },
    _unbind: function (type, el, bubble) {
      (el || this.scroller).removeEventListener(type, this, {capture:!!bubble, passive: false});
      (el || this.scroller).removeEventListener(type, this, {capture: !!bubble, passive: false});
    },