測試 googl his htm eof form har action ()

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>測試</title>
<script>
"use strict";
var user = {age:15,name:"web",getAge:function(){
	alert(this.age)
}};
var jorden = {
	age:30,name:99
}
var text = ‘{ "sites" : [‘ +
    ‘{ "name":"Runoob" , "url":"www.runoob.com" },‘ +
    ‘{ "name":"Google" , "url":"www.google.com" },‘ +
    ‘{ "name":"Taobao" , "url":"www.taobao.com" } ]}‘;
	
	
function checkForm(){
	//alert(this);//"use strict"; 嚴格模式下 返回undefined ;非嚴格模式返回window 就是該全局對象為
	user.getAge(); //輸出:15
	var age = user.getAge.call(jorden); //返回age=30;
	user.getAge();//輸出:15
	//字符串轉json解析
	var obj = JSON.parse(text);
	console.log(obj[‘sites‘][0][‘name‘]); //返回sites對象的第一元素Runoob
	//json對象轉換成字符串
	var str = {"name":"菜鳥教程", "site":"http://www.runoob.com"};
	var str_pretty1 = JSON.stringify(str);
	console.log(typeof str +" "+ typeof str_pretty1); //輸出object string 一個是json對象;一個是字符串
	
}
</script>
</head>

<body>
<form action="#"  method="get" name="myform">
<input name="username" value="" type="text">
<input type="submit" value="提交" onclick="checkForm()" >
<input type="reset" value="重置">
</form>
</body>
</html> 

  

call JSON.parse JSON.stringify typeof 的使用及嚴格模式this的使用