/**
 * 获取对应视图内容的高度
 * @param array - 传来的id数组
 */
const app = getApp()
module.exports = (params, isTabBar) => {
 return new Promise((resolve, reject) => {
 // 获取设备高度
 wx.getSystemInfo({
 success: function(res) {
 let screenHeight = res.windowHeight
 let query = wx.createSelectorQuery();
 for (let i of params) {
 query.select(i).boundingClientRect();
 }
 if (isTabBar) {
 query.select('#container').boundingClientRect();
 }
 query.exec((res) => {
 // 取出每个对应标签容器的高度
 let containerHeight = 0
 if (isTabBar) {
 containerHeight = res[res.length - 1].height
 }
 let noScrollHeight = res.reduce((total, item, index) => {
 if (isTabBar && index == res.length - 1) return total;
 return total + item.height
 }, 0)

 // 用设备高度做减法
 let scrollViewHeight
 if (isTabBar) {
 scrollViewHeight = containerHeight - noScrollHeight
 } else {
 scrollViewHeight = screenHeight - noScrollHeight;
 }
 // 算出来最终滚动条的高度
 resolve(scrollViewHeight)
 });
 }
 })

 })
}