picker选择器 设置默认值如请选择

wxml

      <picker class='li-input' bindchange="pickChange" value="{{sexindex}}" data-value="sexindex" range="{{sexarray}}">
           <text> {{sexarray[sexindex]?sexarray[sexindex]:'请选择'}}</text>
      </picker>

JS data部分

    sexarray: ['男','女'],
    sexindex:'',

JS 点击事件

  pickChange: function (e) {//普通选择器
    var that = this
    let index = e.currentTarget.dataset.value
    that.setData({//点击后更新数据
      [index]: e.detail.value
    });
    // console.log('picker发送选择改变，携带下标为' + e.detail.value)
  },