index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript" src="js/index.js" ></script>
</head>
<body>
<button type="button" id="btn">按钮</button>
<div>
<input type="text" id="txt"/>
</div>
</body>
</html>
index.js
/*
let声明变量:
1.let声明的变量,作用域只是当前代码块
2.let不存在变量提升
3.let暂时性死区
4.const 声明变量:是常量的含义,声明之后不能更改
*/
/*
{
var a=10;
let b=20;
}
console.log(a);
console.log(b);
*/
//模板字符串
var now = new Date();
document.write(`${now.getFullYear()}年${(now.getMonth()+1)}月${now.getDate()}日`)
//箭头函数:可以改变this的值
window.onload = function() {
var btn = document.getElementById("btn");
btn.onclick = () => {
console.log("箭头函数");
}
var txt = document.getElementById("txt");
txt.onblur = function() {
console.log(this.value);
}
}
