27array6.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
// 解构赋值 解析数组或对象的结构为不同的变量提取值
//var name = "along";
//var age = 32;
var [name,age] = ["along",32];
console.log(name);
console.log(age);
//var [x,y,z] = [1,[2.2,2.3]];
//var [x,[y,z]] = [1,[2.2,2.3]];
//console.log(x,y,z); // 1 [2.2,2.3] undefined
var [json,arr,num] = [{a:10,b:20},[1,2,3],10];
var [,,x=4] = [1,2];//传默认值
console.log(x);
var [x,...y] = [10,20,30,40];// 剩余项
console.log(x,y);// 10 [20,30,40]
var arr = [1,2,3];
var [...arr1] = arr; // 克隆数组
console.log(arr1);
var x = 10, y = 20;
/*
var temp = x;
x = y;
y = temp;
*/
[x,y] = [y,x];
console.log(x,y);
</script>
</body>
</html>
27array7.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
var arr = [12, 5, 4, 6, 11, 9];
/* 升序
冒泡排序
12,5,4,6
第一轮 比较3次 得到最大值
5 12 4 6
5 4 12 6
5 4 6 12
第二轮 5 4 6 比较2次 得到第二大的值
4 5 6 12
4 5 6 12
第三轮 比较1次 得到第三大的值
4 5
i j
0 3 0～1 1～2 2～3
1 2 0～1 1～2
.. arr.length-1-i
*/
console.log(bubbleSort(arr));
function bubbleSort(arr) {
// 定义循环 控制轮数
var temp = 0;
for (var i = 0; i < arr.length - 1; i++) {
// 每一轮 进行比较若干次 0 1 2
for (j = 0; j < arr.length - 1 - i; j++) {
// 相邻两数比较
if (arr[j] < arr[j + 1]) {
/*
temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
*/
[arr[j],arr[j+1]] = [arr[j+1],arr[j]];
}
}
}
return arr;
}
// 选择排序
/* 升序
12,5,4,6
5 12 4 6
4 12 5 6
*/
</script>
</body>
</html>
原文地址：https://www.cnblogs.com/HiJackykun/p/11140964.html
时间： 2024-10-10 22:58:15