function toTree(data) {
            let result = []
            if(!Array.isArray(data)) {
                return result
            }
            data.forEach(item => {
                delete item.children;
            });
            let map = {};
            data.forEach(item => {
                map[item.id] 
 
= item;
            });
            data.forEach(item => {
                let parent = map[item.pid];
                if(parent) {
                    (parent.children || (parent.children = [])).push(item);
                } else {
                    result.push(item);
                }
            });
            
 
return result;
        }
        var source2 = [
            { id: 1, pid: 0, name: '揚水裝置' },
            { id: 'ys1', pid: 1, name: '揚水1' },
            { id: 'yszj', pid: 'ys1', name: '揚水子集' },
            { id: 'lxb', pid: 1, name: '離心泵' },
            { id: 'lsbzj', pid: 'lxb', name: '離心泵子集' },
            { id: 
 
6, pid: 0, name: 'body' },
            { id: 2, pid: 6, name: 'title' },
            { id: 3, pid: 6, name: 'div' },
            { id: 4, pid: 3, name: 'span' },
            { id: 5, pid: 3, name: 'icon' }
        ]
        console.log(toTree(source2))
</script>

簡單的json陣列轉換樹形結構.僅作記錄