v-if 绑定表达式的正确写法？

Question

<div v-if=`${["1"].indexOf(formAddAdvert.jumpType)!='-1'}`></div>

Answer 1

<div id="app-3">
  <p v-if="seen">现在你看到我了</p>
</div>

var app3 = new Vue({
  el: '#app-3',
  data: {
    seen: true
  }
})

这是官方的示例

v-if="表达式" 表达式是在引号里的，所以你的问题应该写作 <div v-if="`${['1'].indexOf(formAddAdvert.jumpType) != '-1'}`"></div>

Answer 2

<div v-if=`${["1"].indexOf(formAddAdvert.jumpType)!='-1'}`></div>

to:

<div v-if="['1'].indexOf(formAddAdvert.jumpType) != -1"></div>

下面这句也等效, 不考虑类型的话

 <div v-if="['1'].includes(formAddAdvert.jumpType)"></div>

v-if 内并不用加 ${}

Answer 3

我寻思这不就是

<div v-if="1 !== formAddAdvert.jumpType"></div>