获取chooseMedia的路径 打印出来为一个字符串，然后使用JSON方法失败
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看看基础知识吧
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
他不是json，你用JSON.parse干啥，很迷
我想获取路径 然后将它渲染出来
然后渲染不出来
图2 是渲染的 新手不明白为啥渲染失败
that.setData({tempMedia: [tempMedia]})