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手写草稿.html
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手写草稿.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
var arr = [{
'id': 1,
'parentid': 0
},
{
'id': 4,
'parentid': 2
},
{
'id': 3,
'parentid': 1
},
{
'id': 5,
'parentid': 0
},
{
'id': 6,
'parentid': 0
},
{
'id': 2,
'parentid': 1
},
{
'id': 7,
'parentid': 4
},
{
'id': 8,
'parentid': 1
}
];
function unflatten(arr) {
debugger;
var tree = [],
mappedArr = {},
arrElem,
mappedElem;
// First map the nodes of the array to an object -> create a hash table.
for (var i = 0, len = arr.length; i < len; i++) {
arrElem = arr[i];
mappedArr[arrElem.id] = arrElem;
mappedArr[arrElem.id]['children'] = [];
}
console.log(mappedArr,'-----------mappedArr')
for (var id in mappedArr) {
if (mappedArr.hasOwnProperty(id)) {
console.log(id,'-----------id')
mappedElem = mappedArr[id];
// If the element is not at the root level, add it to its parent array of children.
if (mappedElem.parentid) {
mappedArr[mappedElem.parentid].children.push(mappedElem);
}
// If the element is at the root level, add it to first level elements array.
else {
tree.push(mappedElem);
}
}
}
return tree;
}
var tree = unflatten(arr);
console.log(tree,'...............tree')
</script>
</body>
</html>