JS实现JSON数组合并和去重

var demo1 = [{"id": 0, "name": "牛肉"},{"id": 1,"name": "羊肉"}];

var demo2 = [{"id": 2, "name": "牛肉"},{"id": 3,"name": "鱼肉"},{ "id": 4,"name":"鸡肉"}];

var totalDemo = demo1.concat(demo2);
console.log(totalDemo); //[{"id": 0, "name": "牛肉"},{"id": 1,"name": "羊肉"},{"id": 2, "name": "牛肉"},{"id": 3,"name": "鱼肉"},{ "id": 4,"name":"鸡肉"}]

var temp = {};   //用于name判断重复
var result = [];  //最后的新数组

totalDemo.map(function (item, index) {
    if(!temp[item.name]){
        result.push(item);
        temp[item.name] = true;
    }
});

console.log(result);//[{"id": 0, "name": "牛肉"},{"id": 1,"name": "羊肉"},{"id": 3,"name": "鱼肉"},{ "id": 4,"name":"鸡肉"}];

const arr = [{"id": 0, "name": "牛肉"},{"id": 1,"name": "羊肉"},{"id": 2, "name": "牛肉"},{"id": 3,"name": "鱼肉"},{ "id": 4,"name":"鸡肉"}]

/**
 * JSON数组去重
 * @params {Array} arr 传入的JSON数组
 * @param {String} attrName 根据哪个属性名去重
 * @return {Array} 返回新的去重后的数组
 * */
function delRepeatJson(arr = [], attrName = '') {
    var temp = {}; //用于name判断重复
    var result = []; //最后的新数组

    arr.forEach(function (item, index) {
        if (!temp[item[attrName]]) {
            result.push(item);
            temp[item[attrName]] = true;
        }
    });
    return result;
}

console.log(delRepeatJson(arr, 'name')); // [{"id":0,"name":"牛肉"},{"id":1,"name":"羊肉"},{"id":3,"name":"鱼肉"},{"id":4,"name":"鸡肉"}]