遍历对象:
var obj = {
name: "John",
age: 30,
city: "New York"
};
for (var prop in obj) {
console.log(prop + ": " + obj[prop]);
}
遍历数组:
var arr = ["apple", "banana", "orange"];
for (var i = 0; i < arr.length; i++) {
console.log(arr[i]);
}