js对象数组中的某属性值 拼接成字符串

var objs=[
    {id:1,name:\'张三\'},
    {id:2,name:\'李四\'},
    {id:3,name:\'王五\'},
    {id:4,name:\'赵六\'},
];

var idsStr = objs.map(function(obj,index){
    return obj.id;
}).join(",");

console.log(idsStr);