29object.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>
// 描述一个人的信息
var name = "along";
var sex = "M";
var age = 32;
// liwei
var name = "liwei";
var sex2 = "M";
var age2 = 33;
console.log(name);
// 对象 具体的事物或者抽象的事件
// 对象定义 无序属性的集合
/* 键值对 直接量
var obj = {
k:v,
k:v
...
}
*/
var p1 = {
name:"along", // 属性------特征
sex: "M",
age: 32,
teach: function() { // 方法-----动态
console.log("hard workiong");
}
};
var p2 = {
name:"liwei", // 属性------特征
sex: "M",
age: 33
}
console.log(p1,typeof p1); // object
console.log(p2);
// 访问对象的成员 对象.成员
console.log(p1.age);
console.log(p1[‘age‘]);
var k = ‘sex‘;
console.log(p1[k]); // p1[‘sex‘] p1.k
p1.teach();
// 对象可以动态添加属性
p1.tel = "13988888888";
console.log(p1);
p1.sing = function() {
console.log("along is singing");
}
p1.sing(); // window.sing()
function fn() {
}
fn(); // window.fn();
</script>
</body>
</html>
30object.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>
// 对象的创建方式二 通过new 构造函数 Array String Number Date Function Object...
var arr = new Array(1,2);
/* arr也是对象 可以动态添加属性
arr.index = 10;
console.log(arr.index);
*/
/*
var num = 10;// 基本数据类型 不能添加属性
num.index = 10;
console.log(num.index);
*/
var num = new Number(10);
num.index = 10;
console.log(num.index);
var str = new String("hello");// 字符串对象
function fn() {
}
fn.a = 10;
console.log(fn.a);
</script>
</body>
</html>
31object.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 num = 10;
var num2 = num;// num2 = 10
num = 20;
console.log(num2); // 10
// 引用类型
var obj = {name: "along"};
var obj2 = obj;
obj.name = "along666";
console.log(obj2.name);
var arr = [10,20,30];
var brr = arr;
brr[0] = 100;
console.log(arr[0]);
// arr [100,20,30]
function fn(brr) {
brr[0]--;
}
fn(arr);
console.log(arr[0]); // 99
</script>
</body>
</html>
32string.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 str = "hello";
var str2 = ‘123‘;
*/
function fnCharAt() {
var str = "aBg0hdhadjk123";
var ch = str.charAt(0); // 返回对应位置的字符
var code = str.charCodeAt(3);// 返回对应位置的字符编码 a 97 A 65 0 48
var ch2 = String.fromCharCode(99); // 返回编码对应的字符
console.log(ch);
console.log(code);
console.log(ch2);
}
fnCharAt();
function fnIndexOf() {
var str = "heillwoer23kk";
var index = str.lastIndexOf(‘2‘);
console.log(index);
}
fnIndexOf();
function fnSubstr() {
var str = "welcome to china";
var res = str.substr(3);// 从序号3开始 截取到最后
var res2 = str.substr(3,7);// 从序号3开始 截取7个长度字符
var res3 = str.substring(3);// // 从序号3开始 截取到最后
var res4 = str.substring(3,7); // 从序号3开始 截取到序号为7的前一位为止
var res5 = str.slice(3);// 从序号3开始 截取到最后
var res6 = str.slice(3,7);// 从序号3开始 截取到序号为7的前一位为止
console.log(res); // come to china
console.log(res2);// come to
console.log(res3); // come to china
console.log(res4); // come
console.log(res6);
}
fnSubstr();
function fnSplit() {
var str = "welcome to china";
var arr = str.split(" ");
str = arr.join(" ");
console.log(arr,str);
var filename = "1.4.2.txt";
var res = filename.split(".")
var extname = res[res.length-1];
console.log(extname);
// 1 "http://www.baidu.com?uname=zs&age=22" 如何获取uname和age
// 2 "abcdefg" => "gfedcba"
}
fnSplit()
function fnReplace() {
var str = "nnd 大家好 nnd 我是";
//str = str.replace(‘nnd‘,"***"); // 惰性
console.log(str.split("nnd"));// ["", " 大。。。"," 我是"]
str = str.split("nnd").join("*");
console.log(str);
}
fnReplace();
</script>
</body>
</html>
原文地址：https://www.cnblogs.com/HiJackykun/p/11141131.html
时间： 2024-11-06 07:13:56