var arr = [{
key: '01',
value: '乐乐'
}, {
key: '02',
value: '博博'
}, {
key: '03',
value: '淘淘'
},{
key: '04',
value: '哈哈'
},{
key: '01',
value: '乐乐'
}];
// 方法1：利用对象访问属性的方法，判断对象中是否存在key
var result = [];
var obj = {};
for(var i =0; i<arr.length; i++){
if(!obj[arr[i].key]){
result.push(arr[i]);
obj[arr[i].key] = true;
}
}
console.log(result); // [{key: "01", value: "乐乐"},{key: "02", value: "博博"},{key: "03", value: "淘淘"},{key: "04", value: "哈哈"}]
// 方法2：利用reduce方法遍历数组,reduce第一个参数是遍历需要执行的函数，第二个参数是item的初始值
var obj = {};
arr = arr.reduce(function(item, next) {
obj[next.key] ? '' : obj[next.key] = true && item.push(next);
return item;
}, []);
console.log(arr); // [{key: "01", value: "乐乐"},{key: "02", value: "博博"},{key: "03", value: "淘淘"},{key: "04", value: "哈哈"}]
function deteleObject(obj) {
var uniques = [];
var stringify = {};
for (var i = 0; i < obj.length; i++) {
var keys = Object.keys(obj[i]);
keys.sort(function(a, b) {
return (Number(a) - Number(b));
});
var str = '';
for (var j = 0; j < keys.length; j++) {
str += JSON.stringify(keys[j]);
str += JSON.stringify(obj[i][keys[j]]);
}
if (!stringify.hasOwnProperty(str)) {
uniques.push(obj[i]);
stringify[str] = true;
}
}
uniques = uniques;
return uniques;
}
var
arr = [{
key:
'01'
,
value:
'乐乐'
}, {
key:
'02'
,
value:
'博博'
}, {
key:
'03'
,
value:
'淘淘'
},{
key:
'04'
,
value:
'哈哈'
},{
key:
'01'
,
value:
'乐乐'
}];
// 方法1：利用对象访问属性的方法，判断对象中是否存在key
var
result = [];
var
obj = {};
for
(
var
i =0; i<arr.length; i++){
if
(!obj[arr[i].key]){
result.push(arr[i]);
obj[arr[i].key] =
true
;
}
}
console.log(result);
// [{key: "01", value: "乐乐"},{key: "02", value: "博博"},{key: "03", value: "淘淘"},{key: "04", value: "哈哈"}]
// 方法2：利用reduce方法遍历数组,reduce第一个参数是遍历需要执行的函数，第二个参数是item的初始值
var
obj = {};
arr = arr.reduce(
function
(item, next) {
obj[next.key] ?
''
: obj[next.key] =
true
&& item.push(next);
return
item;
}, []);
console.log(arr);
// [{key: "01", value: "乐乐"},{key: "02", value: "博博"},{key: "03", value: "淘淘"},{key: "04", value: "哈哈"}]