html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JS-对象-Array</title>
</head>
<body>
</body>
<script>
//定义数组
//var arr=new Array(1,2,3);
//var arr=[1,2,3]
//console.log(arr[0]);
//console.log(arr[1]);
//特点；长度可变 类型可变
var arr=[1,2,3];
arr[10]=99;
/*console.log(arr[10]);
console.log(arr[4]);
arr[4]="so";
arr[5]=true;
console.log(arr[4]);
console.log(arr[5]); */
/* for (let i = 0; i < arr.length; i++) {
console.log(arr[i]);
} */
//console.log("===========");
//forEach 遍历数组中有值的元素
/* arr.forEach(function(e){
console.log(e);
}) */
//箭头函数 (..)=>{} 用于简化函数定义
/* arr.forEach((e)=>{
console.log(e);
}) */
//push添加元素到末尾
//arr.push(4,5,6);
//console.log(arr);
//splice 删除数组元素
arr.splice(0,1);
console.log(arr);
</script>
</html>