微信小程序 按鈕滑動的實現方法

<view class="content">
 <view class="sliderContent">
 <input placeholder="驗證碼" placeholder-class="input-placeholder" disabled="{{disabled}}" />
 <view class="slider" bindtouchstart="moveSendBtnStart" bindtouchend="moveSendBtnEnd" bindtouchmove="moveSendBtn" style="left:{{moveSendBtnLeft}}rpx;background-color:{{SendBtnColor}}">發送</view>
 </view>
</view>

.content {
 margin-top: 100rpx;
 font-size: 24rpx;
}

.sliderContent{
 position: relative;
 margin: 0 auto;
 margin-bottom: 50rpx;
 padding-left: 60rpx;
 width: 425rpx;
 box-sizing: border-box;
 height: 70rpx;
 line-height: 70rpx;
 border-radius: 60rpx;
 background-color: #fff;
 color: #289adc;
 box-shadow: 0px 4px 6px 0px rgba(37, 114, 219, 0.3);
}

.sliderContent input {
 line-height: 70rpx;
 height: 70rpx;
 box-sizing: border-box;
 padding-left: 40rpx;
 width: 250rpx;
}

.input-placeholder {
 text-align: center;
 color: #289adc;
}


 .slider {
 position: absolute;
 top: 0;
 left: 0;
 width: 150rpx;
 border-radius: 60rpx;
 text-align: center;
 background-color: #7f7f7f;
 color: #fff;
 box-shadow: 0px 4px 6px 0px rgba(37, 114, 219, 0.3);
}

Page({
 data: {
 moveStartX: 0, //起始位置
 moveSendBtnLeft: 0, //發送按鈕的left屬性
 moveEndX: 0, //結束位置
 screenWidth: 0, //屏幕寬度
 moveable: true, //是否可滑動
 disabled: true,//驗證碼輸入框是否可用,
 SendBtnColor: "#7f7f7f" //滑動按鈕顏色
 },

 onLoad: function () {
 var that = this;
 // 獲取屏幕寬度
 wx.getSystemInfo({
 success: function (res) {
 that.setData({
 screenWidth: res.screenWidth
 })
 },
 })
 },
 // 開始移動
 moveSendBtnStart: function (e) {
 if (!this.data.moveable) {
 return;
 }
 console.log("start");
 console.log(e);
 this.setData({
 moveStartX: e.changedTouches["0"].clientX
 })
 },
 //移動發送按鈕
 moveSendBtn: function (e) {
 if (!this.data.moveable) {
 return;
 }
 var that = this;
 // console.log(e.touches[0]);
 var left = ((e.touches[0].clientX - that.data.moveStartX) / (that.data.screenWidth / 750))
 console.log(left)
 if (left <= 275.5) {
 this.setData({
 moveSendBtnLeft: left
 })
 } else {

 this.setData({
 moveSendBtnLeft: 275.5
 })
 }
 },
 // 結束移動
 moveSendBtnEnd: function (e) {
 console.log("end");
 var that = this;
 var left = ((e.changedTouches[0].clientX - that.data.moveStartX) / (that.data.screenWidth / 750))
 console.log(left);
 if (left < 275.5) {
 for (let i = left; i >= 0; i--) {

 that.setData({
 moveSendBtnLeft: i
 })
 }
 } else {
 that.setData({
 moveEndX: e.changedTouches[0].clientX,
 moveable: false,
 disabled: false,
 SendBtnColor: "#289adc"
 })
 }
 }


})