js陣列物件相同項合併處理
平時工作中會經常遇到資料處理，其中陣列合並處理也會經常遇到，下面就是陣列相同項合併的一種方式：
- 1.首先由原始的陣列arr資料，
- 2.然後建立一個map空物件和一個dest空陣列，通過判斷map中是否含有某項來判斷陣列dest是否新增資料，
- 3.然後再判斷相同項和已有的dest陣列內容比較合併；
var arr = [
{"id":"1","name":"張三","value":"1245"},
{"id":"1","name":"張三","value":"1360"},
{"id":"2","name":"李四","value":"1120"},
{"id":"2","name":"李四","value":"1362"},
{"id":"2","name":"李四","value":"1008"},
{"id":"3","name":"王五","value":"1360"},
{"id":"4","name":"趙六","value":"1986"},
{"id":"4","name":"趙六","value":"1240"}
];
var map = {},dest = [];
for(var i = 0; i < arr.length; i++){
var ai = arr[i];
if(!map[ai.id]){
dest.push({
id: ai.id,
name: ai.name,
value: ai.value
});
map[ai.id] = ai;
}else{
for(var j = 0; j < dest.length; j++){
var dj = dest[j];
if(dj.id == ai.id){
dj.value=(parseFloat(dj.value) + parseFloat(ai.value)).toString();
break;
}
}
}
};
console.log(JSON.stringify(dest));
結果如下
[{"id":"1","name":"張三","value":"2605"},
{"id":"2","name":"李四","value":"3490"},
{"id":"3","name":"王五","value":"1360"},
{"id":"4","name":"趙六","value":"3226"}]