ball-applet/pagesSchool/coaAdmin/stat/lecture.wxml

<mobile-main frameStyle="{{frameStyle}}" bind:back="back">
    <view slot="info" class="container main">
        <view class="top">
            <picker mode="selector" bindchange="schoolChange" name="school_id" value="{{school_id}}" range="{{schoolList}}" range-key="school_id_name">
                <view class="picker">{{zhSchool||'请选择学校'}}</view>
            </picker>
        </view>
        <ec-canvas id="mychart-dom-pie" canvas-id="mychart-pie" ec="{{ ec }}"></ec-canvas>
    </view>
</mobile-main>