使用Impactjs,一个游戏引擎,这里和关卡有这个非常奇怪的设置:
[
{
"entities": [
{"type":"type1","x":100,"y":100,"settings":{"directsTo":"-5"}},
{"type":"type2","x":101,"y":101,"settings":{"directsTo":"-4"}}
],
"layer": [
other data
]
}
]
我想知道如何根据设置对象的directsTo属性获取type1对象的索引?
Javascript或jQuery没问题。
编辑: 游戏必须在移动设备上顺利运行,因此有一个有效的解决方案是好的。
答案 0 :(得分:1)
试试这个,
var arr =[{
"entities": [{
"type": "type1",
"x": 100,"y": 100,
"settings": {"directsTo": "-5"}
}, {
"type": "type2",
"x": 101,"y": 101,
"settings": {"directsTo": "-4"}
}],
"layer": ['other data']
}];
var t='type1';
var newArr=arr[0];
for(var data in newArr){
for(a in newArr[data]){
if(newArr[data][a].type == t){
alert('Index of '+t+' is '+a+' in '+data);
}
}
}
答案 1 :(得分:0)
您可以使用filter
属性吗?
假设您的JS对象看起来像这样
var j = [
{
"entities": [
{"type":"type1","x":100,"y":100,"settings":{"directsTo":"-5"}},
{"type":"type2","x":101,"y":101,"settings":{"directsTo":"-4"}}
],
"layer": [
"otherdata":{}
]
}
];
您可以使用
找到该对象var result = j[0].entities.filter(function(n) { return n.settings.directsTo == "-5"; });
// result[0].type == "type1"
答案 2 :(得分:0)
您可以创建一个函数来获取对象的索引以及其他对象,例如像
//assuming you have the data parsed as a JSON object "data"
//and you also have your entity object as "obj"
function getIndex(obj, data){
return data.entities.indexOf(obj);
}
如果您没有“obj”对象,则必须创建一个函数,该函数首先根据属性查找正确的对象,例如类型参数
function findEntity(type, source){
for(var i=0; i<source.entities.length; i++){
if(source.entities[i].type == type){
return source.entities[i];
}
}
return false;
}
现在你可以这样称呼它
getIndex(findEntity("type1", data), data);
希望它可以帮助你开始!
答案 3 :(得分:0)
感谢Rohan Kumar和ВикторНовиков。
var array =[
{
"entities": [
{
"type": "type1",
"x": 100,"y": 100,
"settings": {"directsTo": "-5"}
},
{
"type": "type2",
"x": 101,"y": 101,
"settings": {"directsTo": "-4"}
}
],
"layer": ['other data']
}
];
function getArrayIndexForLocationKey(arr, val) {
for(var i = 0; i < arr.length; i++){
if(arr[i].settings.directsTo == val)
return i;
}
return -1;
}