微信小程序购物车数量加减功能的实现

/*全局样式*/
page {
padding: 20px 0;
}
/*主容器*/
.stepper {
width:80px;
height:26px;
margin: 0 auto;
border: 1px solid #ccc;
border-radius: 3px;
}
/*加号和减号*/
.stepper text {
float: left;
width: 19px;
line-height: 26px;
text-align: center;
}
/*数值*/
.stepper input {
width: 40px;
height: 26px;
float: left;
margin: 0 auto;
text-align: center;
font-size: 12px;
border-left: 1px solid #ccc;
border-right: 1px solid #ccc;
}
/*普通样式*/
.stepper .normal {
color:black;
}
/*禁用样式*/
.stepper .disable {
color: #ccc;
}

3.js

//index.js
//获取应用实例
const app = getApp()

Page({ data: { num:1,minusStatus:‘disable‘ },//事件处理函数 /*点击减号*/ bindMinus: function() { var num = this.data.num; if (num>1) { num--; } var minusStatus = num>1 ? ‘normal‘:‘disable‘; this.setData({ num:num,minusStatus:minusStatus }) },/*点击加号*/ bindPlus: function() { var num = this.data.num; num++; var minusStatus = num > 1 ? ‘normal‘ : ‘disable‘; this.setData({ num:num,minusStatus: minusStatus }) },/*输入框事件*/ bindManual: function(e) { var num = e.detail.value; var minusStatus = num > 1 ? ‘normal‘ : ‘disable‘; this.setData({ num:num,minusStatus: minusStatus }) }})