hml中picker-view组件设置默认值selected='1'没有触发onchange事件

hml

<div class="container">
    <div class="content">
        <picker-view class="pv1" range="{{picker1range}}" selected="1" onchange="changePv1" />
        <text class="txt">
            分
        </text>
        <image src='/common/huawei_logo.png' class="logo" />
        <picker-view class="pv2" range="{{picker2range}}" selected="1" onchange="changePv2" />
    </div>
    <input type="button" value="开始训练" class="btn" onclick="clickAction" />
</div>

js

import router from '@system.router';

let picker1Value = null;
let picker2Value = null;

export default {
    data: {
        picker1range: ['1', '2', '3'],
        picker2range: ['较慢', '舒慢', '较快']
    },
    clickAction() {
        router.replace({
            uri: 'pages/training/training',
            params: {'pv1': picker1Value, 'pv2': picker2Value}
        })
    },
    changePv1(val) {
        console.log('左边的选中项：' + val.newValue);
        picker1Value = val.newValue;
    },
    changePv2(val) {
        console.log('右边的选中项：' + val.newValue);
        picker2Value = val.newValue;
    }
}