element ui 监听切换不同的tab栏，请求数据

<template>

<el-tabs v-model="activeName" v-on:tab-click="handleClick">

<el-tab-pane label="用户管理" name="first">用户管理</el-tab-pane>

<el-tab-pane label="配置管理" name="second">配置管理</el-tab-pane>

<el-tab-pane label="角色管理" name="third">角色管理</el-tab-pane>

</el-tabs>

</template>

 methods: {
 handleClick(targetName, action) {
                    //alert(targetName.paneName)
                    //first//second//third
                    if (targetName.paneName == "first") {
                      alert(1) //此处写逻辑
                    } else if (targetName.paneName == "second") {
                       alert(2) //此处写逻辑
                    } else if (targetName.paneName == "third") {
                       alert(3) //此处写逻辑
                    }
}