例：

var outArr=[
	{"name":"张三","id":1,age:18},
	{"name":"李四","id":2,age:19},
	{"name":"王五","id":3,age:18},
	{"name":"小红","id":4,age:20},
	{"name":"小明","id":5,age:17},
	{"name":"小白","id":6,age:18}
];
var newArr = outArr.filter(function (obj) {
    return obj.age== 18;
});
console.log(newArr);    // [{"name":"张三","id":1,age:18},{"name":"王五","id":3,age:18},{"name":"小白","id":6,age:18}]

1、方法一在普通js中

<script>
        var obj = {}
        this.obj.name = '123'
        this.obj.age = 12
        console.log(obj, '输出对象obj')
    </script>

效果如图：

2、方法二在vue中
this.$set(对象,‘字段名’,值)
注：字段名用引号

		this.$set(this.obj, 'name', '张三')
        this.$set(this.obj, 'age', 12)
        this.$set(this.obj, 'sex', '男')
        console.log(this.obj, '输出对象obj2')

    mapper  

  <!-- 判断订单属于某些商户 -->
              <if test="merchantIds != null and  merchantIds.size() > 0"> 
                  and MERCHANT_ID in 
                   <foreach item="merId" index="index" collection="merchantIds" open="(" separator="," close=")">   
                        #{merId}        
                   </foreach>
              </if>
   

pojo  

//临时查询字段 商户id集合
    private List<String> merchantIds;

public List<String> getMerchantIds() {
        return merchantIds;
    }

  public void setMerchantIds(List<String> merchantIds) {
        this.merchantIds = merchantIds;
    }