mapv.js:5656 Uncaught TypeError: Cannot read property 'length' of undefined
at Object.getDataSet (mapv.js:5656)
at Object.success (qianxi.html:36)
at i (jquery.min.js:2)
at Object.fireWith [as resolveWith] (jquery.min.js:2)
at A (jquery.min.js:4)
at XMLHttpRequest.<anonymous> (jquery.min.js:4)
getDataSet @ mapv.js:5656
(anonymous) @ qianxi.html:36
i @ jquery.min.js:2
fireWith @ jquery.min.js:2
A @ jquery.min.js:4
(anonymous) @ jquery.min.js:4