echarts????????????????????????????????????????echarts.min.js???????? ????????????????echarts.js??????????????????????ec-canvas????echarts.js??
?????????????????????????????????????????????????????????? [ECharts ????????](http://echarts.baidu.com/builder.html)?????????????????????????????????????????? ?????????????? `ec-canvas/echarts.js`??**???????????????????? `echarts.js`**???? ????????????????TypeError: Cannot read property 'get' of undefined????????????????????????
