vue:error Cannot read property 'length' of undefined
2020-03-01 02:50
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vue:error Cannot read property ‘length’ of undefined
#主要是在浏览器渲染页面时，dataList 为null dataList.length为undefined ，这个要着重处理 v-for 里面的对象数据
1、v-for循环类，加v-if 判断一下 列表是否为null
2、再则看看文件内接口是否取到数据进行一下判断，取到把data值赋给对象，没取到，提示没取到
3、处理数据最好是在created 里面初始化，mounted 加载模板时数据可以直接取到，不容易出错
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