我有一个这样的数据结构:
var someObject = {
'part1' : {
'name': 'Part 1',
'size': '20',
'qty' : '50'
},
'part2' : {
'name': 'Part 2',
'size': '15',
'qty' : '60'
},
'part3' : [
{
'name': 'Part 3A',
'size': '10',
'qty' : '20'
}, {
'name': 'Part 3B',
'size': '5',
'qty' : '20'
}, {
'name': 'Part 3C',
'size': '7.5',
'qty' : '20'
}
]
};
我想使用这些变量访问数据:
var part1name = "part1.name";
var part2quantity = "part2.qty";
var part3name1 = "part3[0].name";
part1name应该用someObject.part1.name的值填充,即“Part 1”。part2quantity也是一样,它的容量是60。
有没有办法实现这与纯javascript或JQuery?
/**
* Access a deep value inside a object
* Works by passing a path like "foo.bar", also works with nested arrays like "foo[0][1].baz"
* @author Victor B. https://gist.github.com/victornpb/4c7882c1b9d36292308e
* Unit tests: http://jsfiddle.net/Victornpb/0u1qygrh/
*/
function getDeepVal(obj, path) {
if (typeof obj === "undefined" || obj === null) return;
path = path.split(/[\.\[\]\"\']{1,2}/);
for (var i = 0, l = path.length; i < l; i++) {
if (path[i] === "") continue;
obj = obj[path[i]];
if (typeof obj === "undefined" || obj === null) return;
}
return obj;
}
适用于
getDeepVal(obj,'foo.bar')
getDeepVal(obj,'foo.1.bar')
getDeepVal(obj,'foo[0].baz')
getDeepVal(obj,'foo[1][2]')
getDeepVal(obj,"foo['bar'].baz")
getDeepVal(obj,"foo['bar']['baz']")
getDeepVal(obj,"foo.bar.0.baz[1]['2']['w'].aaa[\"f\"].bb")
我已经看了所有其他的答案,决定在更可读的代码中添加改进:
function getObjectValByString(obj, str) {
if (typeof obj === "string") return obj;
const fields = str.split(".");
return getObjectValByString(obj[fields[0]], fields.slice(1).join("."));}
下面是一个代码片段:
let someObject = {
合作伙伴:{
id:“目标”,
人:{
名称:“蚂蚁”,
an:{名称:“ESM”},
},
},
};
函数getObjectValByString(obj, str) {
If (typeof obj === "string")返回obj;
Const fields = str.split(".");
返回getObjectValByString(obj[fields[0]], fields.slice(1).join("."));
}
const result = getObjectValByString(someObject, "partner.person.an.name");
console.log ({
结果,
});