Element中的Cascader（级联列表）动态加载省／市／区数据

element中的cascader其实是有动态加载次级选项的方法。方法的原理是利用址（引用）传递，动态修改:options。var c={name: ‘bob’}var d=cd.name = ’tom’console.log(c)// {name: “tom”}http://element-cn.eleme.io/#/…其中找到究竟需要在那层添加数据就变成一个很麻烦的问题。怎么找了？当然只能递归了。简化一下大致思路：var a = [ { value: ‘2’, children: [ { value: ‘2-1’, children: [ { value: ‘2-1-1’, children: [], }, ], }, { value: ‘2-2’, children: [ { value: ‘2-2-1’, children: [], }, { value: ‘2-2-2’, children: [ { value: ‘2-2-2-1’, children: [], }, ], }, ], }, ], },]var b = [‘2’,‘2-2’,‘2-2-1’]那么我们就需要通过b找到a所在的位置。a[0].children[1].children[0]{ value: ‘2-2-1’, children: [], },然后再赋值:a[0].children[1].children[0].children = [{value: ‘2-2-1-1’,children: []}]console.log(a)编写function：findRegionOption(regionOptions, regionArr) { if (_.isEmpty(regionArr) || _.isEmpty(regionOptions)) { return null } let regionId = _.first(regionArr) let regionOption = _.find(regionOptions, regionOption => { return regionOption.value === regionId }) if (!regionOption) { return null } let tailRegionArr = .tail(regionArr) // lodash的tail方法，获取除了array数组第一个元素以外的全部元素。 if (.isEmpty(tailRegionArr)) { return regionOption } return this.findRegionOption(regionOption.children, tailRegionArr)}动态加载数据：loadRegionChild(regionIdArr) { let regionOptions = this.regionHiera let regionOptionInUI = this.findRegionOption(regionOptions, regionIdArr) if ( !regionOptionInUI || !regionOptionInUI.children || regionOptionInUI.children.length > 0 ) { return null } let regionKey = .last(regionIdArr) if (!regionKey) { return null } api .getRegionHiera(regionKey) .then(res => { let regionHiera = res.data regionOptionInUI.children = regionChildrenTransfomed // 动态加载赋值 })}整个页面代码大致就是：<template> <div> <el-cascader :options=“regionHiera” v-model=“selectedRegion” change-on-select/> </div></template><script>export default { name: ‘Test’, data() { return { selectedRegion: [], regionHiera: [ { label: ‘Malaysia’, value: ‘136’, children: [] }, { label: ‘Indonesia’, value: ‘106’, children: [] }, { label: ‘中华人民共和国’, value: ‘100000’, children: [] }, { label: ‘United States’, value: ‘244’, children: [] }, ], } }, watch: { selectedRegion(nv) { this.loadRegionChild(nv) }, }, methods: { findRegionOption(regionOptions, regionArr) { if (.isEmpty(regionArr) || _.isEmpty(regionOptions)) { return null } let regionId = _.first(regionArr) let regionOption = _.find(regionOptions, regionOption => { return regionOption.value === regionId }) if (!regionOption) { return null } let tailRegionArr = .tail(regionArr) if (.isEmpty(tailRegionArr)) { return regionOption } return this.findRegionOption(regionOption.children, tailRegionArr) }, loadRegionChild(regionIdArr) { let regionOptions = this.regionHiera let regionOptionInUI = this.findRegionOption(regionOptions, regionIdArr) if ( !regionOptionInUI || !regionOptionInUI.children || regionOptionInUI.children.length > 0 ) { return null } let regionKey = _.last(regionIdArr) if (!regionKey) { return null } api .getRegionHiera(regionKey) .then(res => { let regionHiera = res.data //后台返回数据 regionOptionInUI.children = regionChildrenTransfomed }) }, }}</script>整体思路还是找到点击后的region，然后动态赋值给children。写的有点乱，希望有帮助吧。