程式碼如下

wxml：

< view class= '{{san?"v1":"v2"}}' bindtap= "selectList"></ view >
css：

.v1 { width: 100 rpx; height: 100 rpx; background: red; border-radius: 50 rpx; }
.v2 { width: 100 rpx; height: 100 rpx; background: gray; border-radius: 50 rpx; }

js：

Page({
data: { san: true, i: 1, //變數

}, // 宣告一個變數，並判斷這個變數 selectList: function () { var that = this; console.log(that.data.i, "i") if (that.data.i == 1) { that.data.i = 2, that.setData({ san: false, }) } else { that.data.i = 1, that.setData({ san: true, }) } console.log(that.data.i, "i2222") },

})