ec-canvas {width: 1200rpx;height:100%;transform: rotate(90deg); -ms-transform: rotate(90deg); /* IE 9 */

  -moz-transform: rotate(90deg); /* Firefox */

  -webkit-transform: rotate(90deg); /* Safari 和 Chrome */

  -o-transform: rotate(0deg)}
<ec-canvas class="mychart-dom-line" style="" wx:for="{{ecList}}" wx:key="index" canvas-id="mychart-line" ec="{{ item }}"></ec-canvas>