参考:https://blog.csdn.net/lllomh/article/details/116007154
<van-field
v-model="password"
:type="passwordType"
name="密码"
label="密码"
placeholder="密码"
:rules="[{ required: true, message: '请填写密码' }]">
<template slot="right-icon">
<span class="solts" @click="switchPasswordType">
<van-icon name="eye" v-if="passwordType==='password'"/>
<van-icon name="closed-eye" v-else />
</span>
</template>
</van-field>
switchPasswordType() {
this.passwordType = this.passwordType === 'password' ? 'text' : 'password'
},