一下子我慌了，我也没干啥啊？？？？
原来时后台返回了一堆null
那么解决：1.找后台让它别给你返回null,忒想返回，那就返回个“”
2.前台解决，那就自己处理数据吧
当然这里只记录下我这里发生的情况（不做问题扩展了），如果不适合您，那就去看看别人的分享吧
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