数组层级叠加

<select class="select" id="select">
    
</select>

var arr = [
        {
            clevel:"1",
            id:"10",
            name:"公司",
            pId:"0"
        },
        {
            clevel:"2",
            id:"10-100",
            name:"测试部",
            pId:"10"
        },
        {
            clevel:"3",
            id:"10-100-100",
            name:"测试一部",
            pId:"10-100"
        },
        {
            clevel:"4",
            id:"10-100-100-100",
            name:"测试一部分部一",
            pId:"10-100-100"
        },
        {
            clevel:"3",
            id:"10-100-101",
            name:"测试二部",
            pId:"10-100"
        },
        {
            clevel:"4",
            id:"10-100-101-100",
            name:"测试二部分部一",
            pId:"10-100-101"
        },
        {
            clevel:"2",
            id:"10-101",
            name:"人事部",
            pId:"10"
        },
        {
            clevel:"2",
            id:"10-102",
            name:"综合部",
            pId:"10"
        },
        {
            clevel:"2",
            id:"10-103",
            name:"国库部",
            pId:"10"
        },
        {
            clevel:"2",
            id:"10-104",
            name:"支付部",
            pId:"10"
        },
        {
            clevel:"2",
            id:"10-106",
            name:"机关部",
            pId:"10"
        }
    ]

    var select = document.getElementById('select');

    var opHtml = '';
    opHtml += "<option value ='0'>请选择</option>";

    var map = {};

    for (var i = 0; i < arr.length; i++) {
        var item = {
            pid: arr[i].pId,
            id: arr[i].id,
            name: arr[i].name
        };
        
        map[arr[i].id] = item;

        var index = item;
        var name = index.name;


        while (map[index.pid] != null) {
            index = map[index.pid];
            name = index.name + "-" + name;
        }
        
        opHtml += "<option name='" + arr[i].name + "' value=1>" + name + "</option>";

    }

    select.innerHTML = opHtml;