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index.html
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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>js 常用方法库</title>
<style>
#box {
/* position: absolute; */
width: 0px;
height: 0px;
content: ' ';
display: block;
border-right: 100px solid red;
border-top: 100px solid #ff0;
border-left: 100px solid blue;
border-bottom: 100px solid green;
}
#select {
user-select: none; /* 禁止用户选择文本 */
}
.taiji {
margin: 10px;
width: 200px;
height: 200px;
border-radius: 50%;
border: 1px solid #000;
overflow: hidden; /* 创建 BFC 并且隐藏左右两边非圆区域 */
position: relative;
animation: customRotate 5s linear infinite;
}
.left {
float: left;
width: 100px;
height: 100%;
background: #000;
}
.rigth {
float: right;
width: 100px;
height: 100%;
background: #fff;
}
.top {
width: 100px;
height: 100px;
border-radius: 50%;
background: #000;
position: absolute;
top: 0;
left: 50%;
transform: translateX(-50%);
}
.bottom {
width: 100px;
height: 100px;
border-radius: 50%;
background: #000;
position: absolute;
bottom: 0;
left: 50%;
transform: translateX(-50%);
background: #fff;
}
.children {
width: 20px;
height: 20px;
border-radius: 50%;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
background: #000;
}
.top .children {
background: #fff;
}
@keyframes customRotate {
from {
transform: rotate(0deg)
}
to {
transform: rotate(360deg)
}
/* 100% {
transform: rotate(360deg)
} */
}
</style>
</head>
<body>
<div id="select">的房价按客服静安寺房间爱上咖啡就</div>发送到发事发地点啊发生的
<div id="box" draggable="true"></div>
<input id="search" type="text"> 搜索
<div class="taiji">
<div class="left"></div>
<div class="right"></div>
<div class="top">
<div class="children"></div>
</div>
<div class="bottom">
<div class="children"></div>
</div>
</div>
<script type="module" src="./test.js"></script>
<script>
function foo() {
console.log(a); // 输出 2，作用域是在函数定义的时候确定的，this是在函数调用的时候确定的
}
function bar() {
var a = 3;
foo();
}
var a = 2;
bar();
// js 只有词法作用域，没有动态作用域
</script>
</body>
</html>