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angular如何将对象转化为数组

数组中的数组products_mes[a]是对象 用indexOf()方法报错 有什么好的方法解决这个问题?

$scope.addCount=function(c,a){
                var arr = [];
                var obj=$scope.products_mes[a];
                console.log(obj);
                
                
                c=c+1;
                };

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没搞明白是要干嘛
如果是数组要判断是否包含某元素 那就 arr.indexOf(item)
如果是对象要判断是否包含某属性 那就 obj.xxx 或者 obj[xxx] 是否为空就行了
var obj = {name:"老王",id:1};
obj.name // "老王"
obj.age // undefined


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