js将数组对象中某个值相同的对象合并成⼀个新对象不知道⼤家在开发过程中有没有遇到这样的数据转换：
数据源是这样的
beforeData: [
{ name: "tony", id: "1", age: "20" },
{ name: "jack", id: "2", age: "21" },
{ name: "tony", id: "3", age: "50" },
{ name: "jack", id: "4", age: "10" },
{ name: "mark", id: "5", age: "22" },
{ name: "mark", id: "6", age: "40" }
]
要将数据中name相同的项合并成⼀个对象（如下）：
afterData: [
{name: "tony",origin: [{ name: "tony", id: "1", age: "20" },{ name: "tony", id: "3", age: "50" }]},
{name: "jack",origin: [{ name: "jack", id: "2", age: "21" },{ name: "jack", id: "4", age: "10" }]},
{name: "mark",origin: [{ name: "mark", id: "5", age: "22" },{ name: "mark", id: "6", age: "40" }]}
]
实现⽅式很简单，记下来⽅便下次使⽤
let tempArr = [];
for (let i = 0; i < this.beforeData.length; i++) {
if (tempArr.indexOf(this.beforeData[i].name) === -1) {
this.afterData.push({
name: this.beforeData[i].name,
origin: [this.beforeData[i]]
js合并两个数组
});
tempArr.push(this.beforeData[i].name);
} else {
for (let j = 0; j < this.afterData.length; j++) {
if (this.afterData[j].name == this.beforeData[i].name) {
this.afterData[j].origin.push(this.beforeData[i]);
break;
}
}
}
}

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