代码语言：javascript复制
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>新增的几个循环方法</title>
</head>
<body>
<script>
let arr = [1,2,3,4];
for (const i in arr) {
console.log(i);//0,1,2,3
}
// for in 默认循环的是坐标
for (const item of arr) {
console.log(item);//1,2,3,4
}
// for of 默认循环的是每一项的内容
arr.forEach((item,i)=>{
console.log(item,i);
})
</script>
</body>
</html>更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/119862067
