就比如说我在小程序里写了一个公共的弹层，点击其中一个弹层会显示对应的内容
js部分如下
layerTap(e){ this.setData({ index: this.data.expert[e.currentTarget.dataset.index], expertDetail: true//显示弹层 })}如果我用箭头函数，就会报【Cannot read property 'setData' of undefined;at "page/discover/discover" page bindViewTap function
TypeError: Cannot read property 'setData' of undefined】代码如下
layerTap:(e)=>{ this.setData({ index: this.data.expert[e.currentTarget.dataset.index], expertDetail: true//显示弹层 })}然而我在onLoad里var that = this然后再setData，依旧会报错【
that is not defined;at "page/discover/discover" page bindViewTap function
ReferenceError: that is not defined
】
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