js中遍历对象属性

/*js中遍历对象属性*/
function printObject(obj) {
    var temp = "";
    for (var key in obj) {
        temp += key + ":" + obj[key] + "\n";
    }
    return temp;
}

/*测试用例*/
var obj = {"a": "1", "b": "2"};
console.log(printObject(obj));