<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>数组与栈</title>
</head>
<body>
<script>
arr2=[1,2,3];
document.write(arr2);
<!--数组本质上是一个Object对象-->
var arr1=new Array(1,2,3);
document.write(typeof arr1)
document.write(arr1[0]);
document.write(arr1.length)
<!--多维数组-->
var arr3=[[1,2,3],[4,5,6]];
arr3[2]=[7,8,9];
document.write(arr3)
document.write(arr3[2][2])
<!--出栈入栈-->
var stack_1=["wendy"];
stack_1.push("red","black");
document.write(stack_1);
stack_1.pop();
document.write(stack_1+"<br>")
<!--入队出队-->
var queue_1=["wendy"];
queue_1.push("red","black");
document.write(queue_1);
check=queue_1.shift();
//删除队列第一个元素并返回
document.write(queue_1);
document.write(check+"<br>");
<!--遍历数组-->
var arr5=["a","wendy","red","black"];
for(var i=0;i<arr5.length;i++)
{
console.log(arr5[i]);
}
<!--forEach回调函数-->
arr5.forEach(function(value,index,arr){
document.write(value+"<br>");
document.write(index+"<br>");
document.write(arr+"<br>");
})
<!--sort方法-->
//遍历数组
var sort_arr=arr5.sort();
document.write(sort_arr+"<br>");
//带回调函数参数的话可以控制升序降序排列，貌似只能针对数字数组
//对字符数组不起作用，默认升序
var num_arr=[1,2,3]
var sort_arr1=num_arr.sort(function(a,b){
return a-b;//升序
//return b-a;//降序
});
console.log(sort_arr1);
</script>
</body>
</html>
