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使用JavaScript怎么實(shí)現(xiàn)一個(gè)無(wú)限層級(jí)的樹(shù)形數(shù)據(jù)結(jié)構(gòu)?相信很多沒(méi)有經(jīng)驗(yàn)的人對(duì)此束手無(wú)策,為此本文總結(jié)了問(wèn)題出現(xiàn)的原因和解決方法,通過(guò)這篇文章希望你能解決這個(gè)問(wèn)題。
js代碼:把扁平數(shù)據(jù)轉(zhuǎn)成樹(shù)形數(shù)據(jù)
function setTreeData(source){ let cloneData = JSON.parse(JSON.stringify(source)) // 對(duì)源數(shù)據(jù)深度克隆 return cloneData.filter(father=>{ // 循環(huán)所有項(xiàng),并添加children屬性 let branchArr = cloneData.filter(child=> father.id == child.parentId); // 返回每一項(xiàng)的子級(jí)數(shù)組 branchArr.length>0 ? father.children=branchArr : '' //給父級(jí)添加一個(gè)children屬性,并賦值 return father.parentId==0; //返回第一層 }); }
根據(jù)網(wǎng)友給我指出的問(wèn)題,之前的算法會(huì)影響到源數(shù)據(jù),之后我對(duì)獲取的數(shù)據(jù)進(jìn)行了深度克隆,完美解決。
封裝函數(shù):
function treeData(source, id, parentId, children){ let cloneData = JSON.parse(JSON.stringify(source)) return cloneData.filter(father=>{ let branchArr = cloneData.filter(child => father[id] == child[parentId]); branchArr.length>0 ? father[children] = branchArr : '' return father[parentId] == 0 // 如果第一層不是parentId=0,請(qǐng)自行修改 }) } // 調(diào)用時(shí),字段名以字符串的形式傳參,如treeData(source, 'id', 'parentId', 'children')
實(shí)例1:使用element-ui的組件制作一個(gè)樹(shù)形多級(jí)嵌套伸縮菜單欄
實(shí)現(xiàn)效果:
vue組件:
<template> <el-tree :data="treeData" :props="defaultProps" accordion @node-click="handleNodeClick"> </el-tree> </template> <script> export default { name: "Test", data(){ return { data : [ {id:1,parentId:0,name:"一級(jí)菜單A",rank:1}, {id:2,parentId:0,name:"一級(jí)菜單B",rank:1}, {id:3,parentId:0,name:"一級(jí)菜單C",rank:1}, {id:4,parentId:1,name:"二級(jí)菜單A-A",rank:2}, {id:5,parentId:1,name:"二級(jí)菜單A-B",rank:2}, {id:6,parentId:2,name:"二級(jí)菜單B-A",rank:2}, {id:7,parentId:4,name:"三級(jí)菜單A-A-A",rank:3}, {id:8,parentId:7,name:"四級(jí)菜單A-A-A-A",rank:4}, {id:9,parentId:8,name:"五級(jí)菜單A-A-A-A-A",rank:5}, {id:10,parentId:9,name:"六級(jí)菜單A-A-A-A-A-A",rank:6}, {id:11,parentId:10,name:"七級(jí)菜單A-A-A-A-A-A-A",rank:7}, {id:12,parentId:11,name:"八級(jí)菜單A-A-A-A-A-A-A-A",rank:8}, {id:13,parentId:12,name:"九級(jí)菜單A-A-A-A-A-A-A-A-A",rank:9}, {id:14,parentId:13,name:"十級(jí)菜單A-A-A-A-A-A-A-A-A-A",rank:10}, ], defaultProps: { children: 'children', label: 'name' } } }, computed:{ treeData(){ let cloneData = JSON.parse(JSON.stringify(this.data)) // 對(duì)源數(shù)據(jù)深度克隆 return cloneData.filter(father=>{ let branchArr = cloneData.filter(child=>father.id == child.parentId) //返回每一項(xiàng)的子級(jí)數(shù)組 branchArr.length>0 ? father.children = branchArr : '' //如果存在子級(jí),則給父級(jí)添加一個(gè)children屬性,并賦值 return father.parentId==0; //返回第一層 }); } }, methods:{ handleNodeClick(data){ // console.log(data) console.log(this.treeData) } }, mounted(){ } } </script> <style scoped> </style>
看完上述內(nèi)容,你們掌握使用JavaScript怎么實(shí)現(xiàn)一個(gè)無(wú)限層級(jí)的樹(shù)形數(shù)據(jù)結(jié)構(gòu)的方法了嗎?如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容,歡迎關(guān)注億速云行業(yè)資訊頻道,感謝各位的閱讀!
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