<!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>
// 打开页面最先执行全局作用域（栈） 先执行全局中的代码
// BOM
// 全局对象
// console.log(window)
// var obj = []
// var obj = {
// id: 1
// }
// var obj2 = obj
// obj2.title = 'hello'
// console.log(obj)
// console.log(obj2)
// console.log(obj2 === obj)
// delete obj2.id
// console.log(obj)
function fe() { // 函数体里代码
var i = 0
console.log(i)
}
// var i = 0'
// console.log(i)
// fe()
var obj = {
id: 10
}
var obj2 = obj
obj.title = '123'
console.log(obj2)
console.log(obj)
console.log(obj === obj2)
</script>
</body>
</html>
