Javascript 从树状对象获取唯一元素列表
在我的小应用程序中，我有一个返回树状数据的函数：Javascript 从树状对象获取唯一元素列表,javascript,arrays,Javascript,Arrays,在我的小应用程序中，我有一个返回树状数据的函数： function getData() { return { "name": "fish", "children": [{ "name": "mussels & clams", "children": [{ "name": "fennel", "size": 1 }, { "name
function getData() {
return {
"name": "fish",
"children": [{
"name": "mussels & clams",
"children": [{
"name": "fennel",
"size": 1
}, {
"name": "garlic",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "onion",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "pasta",
"size": 1
}, {
"name": "rice",
"size": 1
}, {
"name": "soup",
"size": 1
}, {
"name": "tomato",
"size": 1
}]
}, {
"name": "octopus",
"children": [{
"name": "bay",
"size": 1
}, {
"name": "chilli",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "olive oil",
"size": 1
}, {
"name": "paprika",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "pine nuts",
"size": 1
}]
}, {
"name": "oysters",
"children": [{
"name": "asparagus",
"size": 1
}, {
"name": "bacon",
"size": 1
}, {
"name": "butter",
"size": 1
}, {
"name": "cellery",
"size": 1
}, {
"name": "chives",
"size": 1
}, {
"name": "garlic",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "mozzarella",
"size": 1
}, {
"name": "onion",
"size": 1
}, {
"name": "pasta",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "shallot",
"size": 1
}]
}, {
"name": "pink fish",
"children": [{
"name": "balsamic vinegar",
"size": 1
}, {
"name": "chives",
"size": 1
}, {
"name": "cream",
"size": 1
}, {
"name": "dill",
"size": 1
}, {
"name": "garlic",
"size": 1
}, {
"name": "ham",
"size": 1
}, {
"name": "honey",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "lime",
"size": 1
}, {
"name": "mild cheese",
"size": 1
}, {
"name": "miso",
"size": 1
}, {
"name": "potato",
"size": 1
}, {
"name": "sesame",
"size": 1
}, {
"name": "soy souce",
"size": 1
}, {
"name": "spinach",
"size": 1
}, {
"name": "thyme",
"size": 1
}]
}, {
"name": "shrimp",
"children": [{
"name": "coriander",
"size": 1
}, {
"name": "curry",
"size": 1
}, {
"name": "ginger",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "lime",
"size": 1
}, {
"name": "lobster",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "soft cheese",
"size": 1
}, {
"name": "tomato",
"size": 1
}]
}, {
"name": "smoked fish",
"children": [{
"name": "asparagus",
"size": 1
}, {
"name": "butter",
"size": 1
}, {
"name": "eggs",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "mandarin",
"size": 1
}, {
"name": "mild cheese",
"size": 1
}, {
"name": "mushrooms",
"size": 1
}, {
"name": "onion",
"size": 1
}, {
"name": "potato",
"size": 1
}, {
"name": "spring onion",
"size": 1
}]
}, {
"name": "squid",
"children": [{
"name": "bacon",
"size": 1
}, {
"name": "courgette",
"size": 1
}, {
"name": "cumin",
"size": 1
}, {
"name": "garlic",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "lime",
"size": 1
}, {
"name": "onion",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "peper",
"size": 1
}, {
"name": "rocket",
"size": 1
}, {
"name": "thyme",
"size": 1
}]
}, {
"name": "sushi",
"children": [{
"name": "coriander",
"size": 1
}, {
"name": "couscous",
"size": 1
}, {
"name": "cucumber",
"size": 1
}, {
"name": "ginger",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "lime",
"size": 1
}, {
"name": "pepper",
"size": 1
}, {
"name": "rice",
"size": 1
}, {
"name": "sesame",
"size": 1
}, {
"name": "soya souce",
"size": 1
}, {
"name": "spring onion",
"size": 1
}, {
"name": "wasabi",
"size": 1
}]
}, {
"name": "white fish",
"children": [{
"name": "butter",
"size": 1
}, {
"name": "courgette",
"size": 1
}, {
"name": "gream",
"size": 1
}, {
"name": "fennel",
"size": 1
}, {
"name": "french beans",
"size": 1
}, {
"name": "garlic",
"size": 1
}, {
"name": "leak",
"size": 1
}, {
"name": "lemon",
"size": 1
}, {
"name": "lime",
"size": 1
}, {
"name": "mild cheese",
"size": 1
}, {
"name": "onion",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "soup",
"size": 1
}, {
"name": "soya souce",
"size": 1
}, {
"name": "tomato",
"size": 1
}]
}, {
"name": "caviar",
"children": [{
"name": "chives",
"size": 1
}, {
"name": "eggs",
"size": 1
}, {
"name": "sour cream",
"size": 1
}, {
"name": "strong cheese",
"size": 1
}]
}, {
"name": "lobster & crab",
"children": [{
"name": "chili",
"size": 1
}, {
"name": "coriander",
"size": 1
}, {
"name": "fennel",
"size": 1
}, {
"name": "ginger",
"size": 1
}, {
"name": "leek",
"size": 1
}, {
"name": "mayonnaise",
"size": 1
}, {
"name": "parsley",
"size": 1
}, {
"name": "pasta",
"size": 1
}, {
"name": "peas",
"size": 1
}, {
"name": "rice",
"size": 1
}, {
"name": "sesame",
"size": 1
}, {
"name": "soy sauce",
"size": 1
}, {
"name": "wasabi",
"size": 1
}]
}]
};}
- “芦笋”
- “培根”
- “香醋”
- 等等
干杯 检索所有名称属性/属性很容易
var fishNames = nodes.map(function(x){return x.name});
要获取javascript中数组的唯一值，请检查。检索所有名称属性/属性很容易
var fishNames = nodes.map(function(x){return x.name});
要获取javascript中数组的唯一值，请检查。您需要在对象上执行标准树遍历。例如，假设您有一个在每个节点执行回调的函数：
walkObject(obj, function(obj, name, parent){
/* obj === parent[name] */
});
var names = {};
walkObject(nodes, function(obj, name, parent){
if (name !== 'name') return;
names[obj] = true;
});
var uniqueList = Object.keys(names);
希望有帮助。您需要在对象上执行标准树遍历。例如，假设您有一个在每个节点执行回调的函数：
walkObject(obj, function(obj, name, parent){
/* obj === parent[name] */
});
var names = {};
walkObject(nodes, function(obj, name, parent){
if (name !== 'name') return;
names[obj] = true;
});
var uniqueList = Object.keys(names);
希望这会有所帮助。因此，使用诸如或之类的库，您肯定可以非常轻松地做到这一点 然而，这里有一种方法可以让你不用依赖外部
function flatMap (arr, selector) {
return Array.prototype.concat.apply([], arr.map(selector));
}
var names =
flatMap(getData().children, function (x) { return x.children; })
.map(function (x) { return x.name; });
var length = names.length;
var namesAndCount = {};
for (var i = 0; i < length; i++) {
var name = names[i];
namesAndCount[name] = namesAndCount[name] ? namesAndCount[name] + 1 : 1;
}
所以你可以很容易地用一个库，比如，或者 然而，这里有一种方法可以让你不用依赖外部
function flatMap (arr, selector) {
return Array.prototype.concat.apply([], arr.map(selector));
}
var names =
flatMap(getData().children, function (x) { return x.children; })
.map(function (x) { return x.name; });
var length = names.length;
var namesAndCount = {};
for (var i = 0; i < length; i++) {
var name = names[i];
namesAndCount[name] = namesAndCount[name] ? namesAndCount[name] + 1 : 1;
}
不，这不会遍历子节点。你必须遍历整个树。节点是他在脚本中使用的一个变量：
var root=getData（），nodes=radialCluster.nodes（root），…radialCluster.nodes（root）var root=getData（），nodes=radialCluster.nodes（root），…radialCluster.nodes（root）