for in 遍历json

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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>for in 遍历</title></head><body></body></html><script type="text/javascript">var arr={'name':['a','b','c'], //json数据    'age':[1,2,3]};for(var attr in arr){     //for in循环遍历for(var i=0;i<arr[attr].length;i++){console.log(arr[attr][i]);//abc123}}</script>

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