完美解决微信小程序van-field left-icon自定义图片

实现效果：

<view class="userName">
        <van-field left-icon="{{loginUserNameIcon}}" clearable class="fieldName" value="{{ loginUserName }}" placeholder="请输入账号" border="{{ false }}" >
        </van-field>
</view>
<view class="userName">
        <van-field left-icon="{{passwordIcon}}" clearable type="password" class="fieldName" value="{{ loginPassword }}" placeholder="请输入密码" border="{{ false }}" bind:blur ="companyCodeInput"/>
</view>

data中定义：

data: {
 
    loginUserNameIcon:"/pages/img/username.png",
    passwordIcon:"/pages/img/psw.png",

  },