小程序开发之改变data中数组或对象的某一属性值

前言：在小程序的开发中，我们在view中便利data中数组或对象时，很多情况下需要在js中动态改变数组或者对象中某一香的属性值。

效果图：

我给大家总结了案例如下：

wxml如下：

<scroll-view class=‘hd-cont‘ scroll-x="true" style=‘width: 100%‘>
    <view wx:for="{{sDate}}" wx:key="{{index}}" class=‘date-cont‘>
        <view>{{item.week}}</view>
        <view bindtap=‘select‘ data-index="{{index}}" class=‘ curl {{item.selected}}‘>{{item.date}}</view>
    </view>
</scroll-view>

wxss如下：

.hd-cont {
    height: 126rpx;
    white-space: nowrap;
    padding-left: 20rpx;
    color: #fff;
    font-size: 28rpx;
    box-sizing: border-box;
}
.date-cont {
    width: 40rpx;
    margin-right: 70rpx;
    height: 100%;
    display: inline-block;
    padding-top: 10rpx;
    box-sizing: border-box;
    text-align: center;
}
.curl {
    width: 40rpx;
    height: 40rpx;
    border-radius: 50%;
    line-height: 40rpx;
}
.date-cont view:first-child {
    margin-bottom: 20rpx;
}
.focus {
    display: inline-block;
    width: 40rpx;
    height: 40rpx;
     font-family: Monaco;">#fff;
    color: #16cc80;
    border-radius: 50%;
    line-height: 40rpx;
}

wxjs如下：

实现思路：点击某一个日期时，获取当前点击的下表，点击事件bindtap可以获取到所点击的元素的自定义属性，也就是所点击的元素的在data中数组的下标，点击触发，清空所有对象中selected的值，然后将所点击的下标的selected值变为focus就可实现点击某一元素动态改变数组中的某一属性值。

Page({
data: {
    sDate: [
        { "week": "日", "date": "01" ,"selected": "focus" },
        { "week": "一", "date": "02", "selected": " " },
        { "week": "二", "date": "03", "selected": " " },
        { "week": "三", "date": "04", "selected": " " },
        { "week": "四", "date": "05", "selected": " " },
        { "week": "五", "date": "06", "selected": " " },
        { "week": "六", "date": "07", "selected": " " },
        { "week": "日", "date": "08", "selected": " " },
        { "week": "一", "date": "09", "selected": " " },
        { "week": "二", "date": "10", "selected": " " },
        { "week": "三", "date": "11", "selected": " " },
        { "week": "四", "date": "12", "selected": " " },
        { "week": "五", "date": "13", "selected": " " },
        { "week": "六", "date": "14", "selected": " " },
    ]
},
select: function (e) {
    var oIndex = e.currentTarget.dataset.index;
    var array = this.data.sDate;
    array.forEach( (item,index,arr) => {
        var sItem = "sDate["+ index + "].selected";
        this.setData({
            [sItem]: " "
        })
        console.log([sItem]);
        if(index == oIndex) {
            var oSelected = "sDate[" + index + "].selected"//这里需要将设置的属性用字符串进行拼接
            this.setData({
            [oSelected]: "focus"
            })
        }
    })
},
})

这里狗尾草也就给大家总结完了，希望对大家有所帮助，有问题记得及时反馈哦，狗尾草和大家一起进步。

原文地址：https://www.cnblogs.com/bgwhite/p/9265849.html