函数调用
<!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>
</body>
<script>
//函数调用
// 函数内部的this指向window
var age=18;
var p={
age:15,
say:function(){
console.log(this.age);
}
}
var f1=p.say; //f1是函数
f1(); //函数调用-->this：window -->this.age=18
</script>
</html>
this 的含义：函数内部的this指向window