微信小程序实现拖拽功能
<view class='collectBox' bindtap='addCollect' wx:if="{{write[0]+write[1] > 0}}" bindtouchmove="touchmove" catch:touchmove style="left:{{write[0]}}px;top:{{write[1]}}px;"> <image src='../../images/icon/addcollect.png'></image> </view>
// pages/cateDetaile/cateDetaile.js const app = getApp() Page({ /** * 页面的初始数据 */ data: { // 拖拽参数 writePosition: [80, 90], //默认定位参数 writesize: [0, 0],// X Y 定位 window: [0, 0], //屏幕尺寸 write: [0, 0], //定位参数 scrolltop: 0,//据顶部距离 }, /** * 生命周期函数--监听页面加载 */ onLoad: function (options) { // 在页面中定义插屏广告 let that = this; that.getSysdata(); }, //计算默认定位值 getSysdata: function () { var that = this; wx.getSystemInfo({ success: function (e) { that.data.window = [e.windowWidth, e.windowHeight]; var write = []; write[0] = that.data.window[0] * that.data.writePosition[0] / 100; write[1] = that.data.window[1] * that.data.writePosition[1] / 100; console.log(write,45) that.setData({ write: write }, function () { // 获取元素宽高 wx.createSelectorQuery().select('.collectBox').boundingClientRect(function (res) { console.log(res.width) that.data.writesize = [res.width, res.height]; }).exec(); }) }, fail: function (e) { console.log(e) } }); }, //开始拖拽 touchmove: function (e) { var that = this; var position = [e.touches[0].pageX - that.data.writesize[0] / 2, e.touches[0].pageY - that.data.writesize[1] / 2 - this.data.scrolltop]; that.setData({ write: position }); }, onPageScroll(e) { this.data.scrolltop = e.scrollTop; }, })
总结
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