已知一个多层嵌套的json，取出所有父元素和子元素的id值
思路：因为不知道到底嵌套了多少层，递归有可能造成栈溢出、查询时间特别久的问题
所以先查询一次，判断是否有子节点，如果有，取出子节点并到父节点上，并动态更改数据长度，这样无限循环处理json取出所有id
menuIdInit () { var _this = this; var _menu = _this.menus; var menuId = []; var len = _menu.length; for(var i = 0; i < len; i++){ var item = _menu[i] ; if(item.child && item.child.length != 0){ var child = item.child ; for(var j = 0; j < child.length; j++){ _menu[len + j] = child[j] ; } len = _menu.length ; } menuId.push(item.id); } this.menusTree = menuId ; },
已知子节点id取出所有父节点id的方法
思路和上面的一样，不过更复杂了一点
一个N层嵌套的json
1。先遍历json数据，做处理，取出所有children节点并到原始数据上并给了新属性parentNode，它的值是所有他的上一级的父节点id
2。遍历查询id，只需要查询最外面一层的id就是所有子节点和父节点的id属性了
3。获取值
//json的处理 function searchInit(json) { var newJson = json.concat([]); var len = newJson.length; //长度 var parentNode = []; console.log('newJson', newJson); for (var i = 0; i < len; i++) { var item = newJson[i]; if (item.children && item.children.length != 0) { var child = item.children; for (var j = 0; j < child.length; j++) { if (item.parentNode) { child[j].parentNode = item.parentNode.concat([item.id]); } else { child[j].parentNode = [item.id] } console.log(item.parentNode, item.id); newJson[len + j] = child[j]; } len = newJson.length; } } return newJson; } //搜索当前权限，获得所有父级权限id function searchTree(json, id) { console.log("tree",json); var newJson = json.concat([]); var len = newJson.length; //长度 console.log("json",len); var parentNode = []; //查找id for (var s = 0; s < len; s++) { if (newJson[s].id == id) { if (newJson[s].parentNode == null || newJson[s].parentNode.length == 0) { parentNode = []; } else { parentNode = newJson[s].parentNode; } } else { continue; } } return parentNode; } //获取最终所有权限列表id //json :最初的权限列表 //keys :用户点击获取Vue获取到的最底层权限id数组 function getKeys(json, keys) { var final = []; for (var i = 0; i < keys.length; i++) { var final = searchTree(json, keys[i]).concat(final); } if (json.length == 0 || keys.length == 0) { return []; } else { var c = $.unique((final.concat(keys)).sort()); return c; } }
JSON数据
{ "children": [ { "children": [ { "children": [ { "children": null, "name": "浏览", "id": 443, "label": "浏览", "open": true, "parentNode": [ 121, 232, 411 ] }, { "children": null, "name": "批量删除", "id": 420, "label": "批量删除", "open": true, "parentNode": [ 121, 232, 411 ] }, { "children": null, "name": "搜索", "id": 415, "label": "搜索", "open": true, "parentNode": [ 121, 232, 411 ] }, { "children": null, "name": "删除", "id": 414, "label": "删除", "open": true, "parentNode": [ 121, 232, 411 ] }, { "children": null, "name": "编辑", "id": 413, "label": "编辑", "open": true, "parentNode": [ 121, 232, 411 ] }, { "children": null, "name": "新增", "id": 412, "label": "新增", "open": true, "parentNode": [ 121, 232, 411 ] } ], "name": "芯片备案", "id": 411, "label": "芯片备案", "open": true, "parentNode": [ 121, 232 ] }, { "children": [ { "children": null, "name": "编辑", "id": 403, "label": "编辑", "open": true, "parentNode": [ 121, 232, 401 ] }, { "children": null, "name": "新增", "id": 402, "label": "新增", "open": true, "parentNode": [ 121, 232, 401 ] } ], "name": "软件版本管理", "id": 401, "label": "软件版本管理", "open": true, "parentNode": [ 121, 232 ] }, { "children": [ { "children": [ { "children": null, "name": "浏览", "id": 442, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 371 ] }, { "children": null, "name": "删除", "id": 374, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 371 ] }, { "children": null, "name": "编辑", "id": 373, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 371 ] }, { "children": null, "name": "新增", "id": 372, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 371 ] } ], "name": "内容源支持项管理", "id": 371, "label": "内容源支持项管理", "open": true, "parentNode": [ 121, 232, 241 ] }, { "children": [ { "children": [ { "children": null, "name": "浏览", "id": 441, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 311, 351 ] }, { "children": null, "name": "删除", "id": 354, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 311, 351 ] }, { "children": null, "name": "编辑", "id": 353, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 311, 351 ] }, { "children": null, "name": "新增", "id": 352, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 311, 351 ] } ], "name": "一体机管理", "id": 351, "label": "一体机管理", "open": true, "parentNode": [ 121, 232, 241, 311 ] }, { "children": [ { "children": null, "name": "浏览", "id": 440, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 311, 341 ] }, { "children": null, "name": "删除", "id": 344, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 311, 341 ] }, { "children": null, "name": "编辑", "id": 343, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 311, 341 ] }, { "children": null, "name": "新增", "id": 342, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 311, 341 ] } ], "name": "遥控器管理", "id": 341, "label": "遥控器管理", "open": true, "parentNode": [ 121, 232, 241, 311 ] }, { "children": [ { "children": null, "name": "浏览", "id": 439, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 311, 331 ] }, { "children": null, "name": "删除", "id": 334, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 311, 331 ] }, { "children": null, "name": "编辑", "id": 333, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 311, 331 ] }, { "children": null, "name": "新增", "id": 332, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 311, 331 ] } ], "name": "蓝牙管理", "id": 331, "label": "蓝牙管理", "open": true, "parentNode": [ 121, 232, 241, 311 ] }, { "children": [ { "children": null, "name": "浏览", "id": 438, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 311, 321 ] }, { "children": null, "name": "删除", "id": 324, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 311, 321 ] }, { "children": null, "name": "编辑", "id": 323, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 311, 321 ] }, { "children": null, "name": "新增", "id": 322, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 311, 321 ] } ], "name": "Wi-Fi管理", "id": 321, "label": "Wi-Fi管理", "open": true, "parentNode": [ 121, 232, 241, 311 ] } ], "name": "硬件型号管理", "id": 311, "label": "硬件型号管理", "open": true, "parentNode": [ 121, 232, 241 ] }, { "children": [ { "children": [ { "children": null, "name": "浏览", "id": 437, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 291, 296 ] }, { "children": null, "name": "删除", "id": 299, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 291, 296 ] }, { "children": null, "name": "编辑", "id": 298, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 291, 296 ] }, { "children": null, "name": "新增", "id": 297, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 291, 296 ] } ], "name": "RAM", "id": 296, "label": "RAM", "open": true, "parentNode": [ 121, 232, 241, 291 ] }, { "children": [ { "children": null, "name": "浏览", "id": 436, "label": "浏览", "open": true, "parentNode": [ 121, 232, 241, 291, 292 ] }, { "children": null, "name": "删除", "id": 295, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 291, 292 ] }, { "children": null, "name": "编辑", "id": 294, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 291, 292 ] }, { "children": null, "name": "新增", "id": 293, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 291, 292 ] } ], "name": "EMMC", "id": 292, "label": "EMMC", "open": true, "parentNode": [ 121, 232, 241, 291 ] } ], "name": "储存选项管理", "id": 291, "label": "储存选项管理", "open": true, "parentNode": [ 121, 232, 241 ] }, { "children": [ { "children": null, "name": "新增", "id": 282, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 281 ] } ], "name": "屏幕尺寸管理", "id": 281, "label": "屏幕尺寸管理", "open": true, "parentNode": [ 121, 232, 241 ] }, { "children": [ { "children": null, "name": "新增", "id": 272, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 271 ] } ], "name": "Android版本管理", "id": 271, "label": "Android版本管理", "open": true, "parentNode": [ 121, 232, 241 ] }, { "children": [ { "children": null, "name": "删除", "id": 264, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 261 ] }, { "children": null, "name": "编辑", "id": 263, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 261 ] }, { "children": null, "name": "新增", "id": 262, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 261 ] } ], "name": "品牌管理", "id": 261, "label": "品牌管理", "open": true, "parentNode": [ 121, 232, 241 ] }, { "children": [ { "children": null, "name": "删除", "id": 254, "label": "删除", "open": true, "parentNode": [ 121, 232, 241, 251 ] }, { "children": null, "name": "编辑", "id": 253, "label": "编辑", "open": true, "parentNode": [ 121, 232, 241, 251 ] }, { "children": null, "name": "新增", "id": 252, "label": "新增", "open": true, "parentNode": [ 121, 232, 241, 251 ] } ], "name": "内容商管理", "id": 251, "label": "内容商管理", "open": true, "parentNode": [ 121, 232, 241 ] } ], "name": "机型属性配置", "id": 241, "label": "机型属性配置", "open": true, "parentNode": [ 121, 232 ] } ], "name": "基础数据管理", "id": 232, "label": "基础数据管理", "open": true, "parentNode": [ 121 ] }, { "children": [ { "children": null, "name": "新增", "id": 142, "label": "新增", "open": true, "parentNode": [ 121, 141 ] } ], "name": "机型备案", "id": 141, "label": "机型备案", "open": true, "parentNode": [ 121 ] }, { "children": null, "name": "报备管理", "id": 131, "label": "报备管理", "open": true, "parentNode": [ 121 ] } ], "name": "设备管理", "id": 121, "label": "设备管理", "open": true }
我又写了一个简单一点的方法：
ES6对数组有新增的很简单的方法，有兴趣的可以尝试下，我忘记怎么用了，以后再更新
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<button onclick="add()">添加父节点</button>
<script>
var demo = [{
"children": [{
"children": [{
"children": [{
"children": [{
"children": [{
"children": [],
"index": "111111"
}],
"index": "11111"
}, {
"children": [],
"index": "11112"
}],
"index": "1111"
}, {
"children": [],
"index": "1112"
}],
"index": "111"
}, {
"children": [{
"children": [],
"index": "1121"
}, {
"children": [],
"index": "1122"
}],
"index": "112"
}, {
"children": [],
"index": "113"
}],
"index": "11"
}, {
"children": [],
"index": "12"
}],
"index": "1"
}];
console.log("old", demo);
function add() {
init(demo);
addNode(demo)
console.log("new", demo);
}
function init(item) {
for (let i = 0; i < item.length; i++) {
item[i]["parent"] = [];
item[i]["parent"].push(item[i]["index"]);
if (item[i].children.length !== 0) {
var oChild = item[i].children;
init(oChild);
}
}
return item;
}
function addNode(item) {
// debugger
for (let i = 0; i < item.length; i++) {
var parent = item[i]["parent"];
if (item[i].children.length !== 0) {
var oChild = item[i].children;
for (let j = 0; j < oChild.length; j++) {
console.log("oChild", oChild);
oChild[j]["parent"] = oChild[j]["parent"].concat(parent);
}
addNode(oChild);
}
}
return item;
}
</script>
</body>
</html>
本文首发于Calamus的博客。
