关于v-if判断用法

<el-col :span="4" :offset="1" v-if="this.isTitileUpdate == true">
    <el-button @click="handleTitleUpdate()" type="text">修改</el-button>
</el-col>
<el-col :span="4" :offset="1" v-if="this.isTitileUpdate == false">
    <el-button @click="handleSaveTitle()" type="text">保存</el-button>
</el-col>

在js中定义

this.isTitileUpdate: true