js for循环 遍历数组 遍历对象属性

1、js for循环 遍历对象属性

var person = {fname:"John",lname:"Doe",age:25};

for (x in person) {
    console.log(x + "=" + person[x]);
}

控制台输出结果：

fname=John
lname=Doe
age=25

2、js for循环 遍历数组

var mycars = new Array("Saab","Volvo","BMW");

for (x in mycars){
    console.log(x + "=" + mycars[x])
}

控制台输出结果：

0=Saab
1=Volvo
2=BMW