在设计树形结构的数据时候，数据库一般为：id,name,parent...如果后端不处理直接返给前端，前端就需要把这个一维数组转换为树形结构数组。下面整理了下如何通过js实现一维数组转换为树形结构数组。

js代码实现：

/*
 *函数定义
 *入口参数data,平行数组
 *key，id字段
 *parentKey，父字段
 *map,需要将原始属性名称转换为什么名称
 */
function treeUtil(data, key, parentKey, map) {
	this.data = data;
	this.key = key;
	this.parentKey = parentKey;
	this.treeParentKey = parentKey; //parentKey要转换成什么属性名称
	this.treeKey = key; //key要转换成什么属性名称
	this.map = map;
	if(map) {
		if(map[key]) this.treeKey = map[key];
	}
	this.toTree = function() {
		var data = this.data;
		var pos = {};
		var tree = [];
		var i = 0;
		while(data.length != 0) {
			if(data[i][this.parentKey] == 0) {
				var _temp = this.copy(data[i]);
				tree.push(_temp);
				pos[data[i][this.key]] = [tree.length - 1];
				data.splice(i, 1);
				i--;
			} else {
				var posArr = pos[data[i][this.parentKey]];
				if(posArr != undefined) {
					var obj = tree[posArr[0]];
					for(var j = 1; j < posArr.length; j++) {
						obj = obj.children[posArr[j]];
					}
					var _temp = this.copy(data[i]);
					obj.children.push(_temp);
					pos[data[i][this.key]] = posArr.concat([obj.children.length - 1]);
					data.splice(i, 1);
					i--;
				}
			}
			i++;
			if(i > data.length - 1) {
				i = 0;
			}
		}
		return tree;
	}
	this.copy = function(item) {
		var _temp = {
			children: []
		};
		_temp[this.treeKey] = item[this.key];
		for(var _index in item) {
			if(_index != this.key && _index != this.parentKey) {
				var _property = item[_index];
				if((!!this.map) && this.map[_index])
					_temp[this.map[_index]] = _property;
				else
					_temp[_index] = _property;
			}
		}
		return _temp;
	}
}

使用：

//使用示例，data需要有key parentKey属性，其它属性内容没有限制。
var data=[
    {id:1,parent:0,name:'A'},
    {id:2,parent:4,name:"B"},
    {id:3,parent:7,name:"C"},
    {id:4,parent:1,name:"D"},
    {id:5,parent:0,name:"E"},
    {id:6,parent:5,name:'B'},
    {id:7,parent:4,name:"F"}
];
//简单使用
var tree = new treeUtil(data, 'id', 'parent');
console.log(tree.toTree());
//带属性名称转换
data=[
    {id:1,parent:0,name:'A'},
    {id:2,parent:4,name:"B"},
    {id:3,parent:7,name:"C"},
    {id:4,parent:1,name:"D"},
    {id:5,parent:0,name:"E"},
    {id:6,parent:5,name:'B'},
    {id:7,parent:4,name:"F"}
];
var map = {
	"name":"title","id": "id0"
};
var tree1 = new treeUtil(data, 'id', 'parent', map);
console.log(tree1.toTree());

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