对象的遍历
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>买了否冷</title>
</head>
<body>
<script>
var obj = {
name : '老胡',
year : 28,
hobbies : ['斗地主','变魔术'],
Swimming:function(){
console.log('洗个澡吧');
}
</script>
</body>
</html>1、使用Object.keys()遍历
Object.keys(obj).forEach(function (key) {
console.log(key,obj[key])
})
2、使用for..in..遍历
for (var i in obj) {
console.log(i,':',obj[i])
}
3、使用Object.getOwnPropertyNames(obj)遍历
Object.getOwnPropertyNames(obj).forEach(function (key) {
console.log(key,obj[key])
})
4、使用Reflect.ownKeys(obj)遍历
Reflect.ownKeys(obj).forEach(function (key) {
console.log(key,obj[key])
})
数组的遍历
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>买了否冷</title>
</head>
<body>
<script>
var arr = [123,'abc',true,[1,2,3]]
</script>
</body>
</html>1、使用forEach遍历
arr.forEach(function (value,index) {
console.log(value,index)
})
2、使用for..in..遍历
for (i in arr) {
console.log(i,arr[i])
}
3、使用for-of遍历
for (var value of arr){
console.log(value)
}
