Uncaught TypeError: Cannot read property 'DYMC' of null

最新推荐文章于 2020-08-06 10:10:17 发布

原创最新推荐文章于 2020-08-06 10:10:17 发布 · 189 阅读

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文章标签：

#json #javascript #property

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本文通过一个具体的JavaScript代码示例，展示了在遍历包含null元素的数组时可能遇到的错误，并提供了解决方案。文章强调了在访问数组元素属性前进行非空检查的重要性，避免因读取null的属性而导致的运行时错误。

    var arr = [null,{"ADDR":"","BZ":"","CZSJ":"","DYMC":"哈哈","FJH":"","GRMJ":"","GRQ":"","GRQF":0,"KH":"","LHMC":"","QFJE":0,"SFLX":"","TRQF":0,"XQMC":"","YHBH":"","YHLB":"","YHXM":"","ZNJ":0}]
for(var i in arr){
        console.log(arr[i].DYMC);
 }

报错

Uncaught TypeError: Cannot read property 'DYMC' of null
    at 1.html:13

原因数组遍历是因为有null
更改：

 var arr = [null,{"ADDR":"","BZ":"","CZSJ":"","DYMC":"哈哈","FJH":"","GRMJ":"","GRQ":"","GRQF":0,"KH":"","LHMC":"","QFJE":0,"SFLX":"","TRQF":0,"XQMC":"","YHBH":"","YHLB":"","YHXM":"","ZNJ":0}]
        for(var i in arr){
            if(arr[i]!=null){
                console.log(arr[i].DYMC);
            }
        }