Uncaught TypeError: Cannot read property 'length' of null错误怎么处理？

Uncaught TypeError: Cannot read property 'length' of null

错误怎么处理？

1.可能是返回的datagrid数据格式有问题，比如{"total":0,"rows":null}，改为{"total":0,"rows":"[]"}就可以了

 

if (capital != null && capital.length < 1) {