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编码猿
2024-09-27 02:06:13 +08:00
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<!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>Document</title>
</head>
<body>
<button class="one">A</button>
<button class="two">B</button>
<button class="three">C</button>
<a href=""></a>
</body>
<script>
console.log(window)
var name = 250
// if (name >= 200 && name <= 300 ) {
// console.log("王一鸣是250");
// }else{
// console.log("王一鸣还是250");
// }
if (name < 200 || name > 300) {
console.log("王一鸣是250");
} else {
console.log("王一鸣还是250");
}
var cj = 75,
fl;
if (cj < 60) {
fl = "不及格"
} else if (cj >= 60 && cj < 70) {
fl = "及格"
} else if (cj >= 70 && cj < 80) {
fl = "良好"
} else {
fl = "优秀"
}
console.log(fl)
// 只有当i<50成立的时候即ture 才会执行i++。 例:i>50,false,不执行 输出undefined。
for (var i = 1; i < 50; i++) {
console.log(i);
}
// 九九乘法表 一层套一层
// 外层总共九行,所以定义一个名=公式 自动换行总共九行
for (var i = 1; i <= 9; i++) {
var all = ""
// 内层无数行,所以打印日志在外层,轻松实现换行
for (var j = 1; j <= i; j++) {
// all += j + "*" + i + "=" + i*j + ' '
all += `${j}*${i}=${i*j} `
}
all += `</br>`
// document.write(all)
}
var A = new Object({
Number: 20,
sex: "男",
name: "猪"
})
console.log(A);
console.log(A.name);
console.log(A["name"]);
// Key 是基于for in才被访问到的。key可以被定义为各种名称的常量
// B基于for in才被访问到 所以是局部常量
for (const B in A) {
console.log(B)
}
var A = new Object();
A.name = "哈1";
A.age = "哈2";
console.log(A);
FFF = 1
console.log(FFF);
// 去掉var,变量提升,且只提升一级
function a() {
var b = function () {
aaa = 1
}
console.log(aaa);
}
// 回调函数
function testa(n) {
// 执行n,n接收的ttt所以实际执行的是ttt的function,即123
n()
}
var tttt = function () {
console.log(123);
}
testa(tttt)
// 回调案例
function test(call, n) {
console.log('call', call);
var a = call()
n += a
console.log('n', n);
}
function b() {
return 1 + 1
}
test(b, 2)
// <button class="one">A</button>
// <button class="two">B</button>
// <button class="three">C</button>
// 事件的写法
// querySelector只能查询第一个
var all = document.querySelectorAll("button")
for (var i = 0; i < all.length; i++) {
all[i].innerText = "你好"
console.log('all', all[i]);
}
</script>
</html>