for in 循环

文章地址: https://www.cnblogs.com/sandraryan/

    // for in 遍历数组和对象
    var Dog = {
        name: 'jack',
        age: 2,
        eat: function(){
            console.log('eating');
        }
    }

    // Dog.eat();
    // console.log(Dog);    
    for(k in Dog){
        console.log(k);
        console.log(Dog[k]); 
    }

 一般变量用k 或者key

console.log(k);获取的是属性/方法名

console.log(Dog[k]); 获取的是属性方法值