let ha = [
 {id:'H',name:'3'},
 {id:'A',name:'6'},
 {id:'B',name:'14'},
 {id:'C',name:'60'}
 ];

let hb= [ 
 {id:'H',name:'2'},
 {id:'A',name:'6'},
 {id:'B',name:'16'}, 
 {id:'N',name:'2'},
 {id:'C',name:'19'}
 ];

// 合并两个json数组，并去重;

ha= Object.assign([], ha, hb);
console.log('ha',ha);

// [ 
 {id:'H',name:'2'},
 {id:'A',name:'6'},
 {id:'B',name:'16'}, 
 {id:'N',name:'2'},
 {id:'C',name:'19'}
 ];


// 去除json数组中的某一项

ha.splice(3, 1);
console.log('ha',ha);

// [ 
 {id:'H',name:'2'},
 {id:'A',name:'6'},
 {id:'B',name:'16'}, 
 {id:'C',name:'19'}
 ];

var str1=[{name:"11",age:11}];
var str2=[{name:"22",age:22}];
 
var str3 = [];
 
for (var i = 0; i < str1.length; i++) {
  str3.push(str1[i]);
}
 
for (var i = 0; i < str2.length; i++) {
  str3.push(str2[i]);
}
 
--------------
 
var str3 = str1.concat(str2);

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"}];