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this指向问题220504.html

<!--
 * @Author: yaojian66 1327629137@qq.com
 * @Date: 2022-05-04 11:33:29
 * @LastEditors: yaojian66 1327629137@qq.com
 * @LastEditTime: 2022-05-04 11:35:27
 * @FilePath: \geyao\this指向问题220504.html
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
-->
<!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>this指向</title>
</head>
<body>
  <script>
    function foo() {
  console.log(this.a)
}
var a = 1
foo() //1

const obj = {
  a: 2,
  foo: foo
}
obj.foo()//2

const c = new foo()//undefined
  </script>
</body>
</html>