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//.wxml
<van-fieldmodel:value="{{ userName }}"placeholder="请输入学号"focus="{{focusUserName}}"/>
// .js
this.setData({focusUserName: true});
vant-field
//.wxml
<van-fieldmodel:value="{{ userName }}"placeholder="请输入学号"focus="{{focusUserName}}"/>
// .js
this.setData({focusUserName: true});
vant-field