lovecoding
/
class


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 
        函数
        格式：
            function 名字(形参) {执行的代码}
            必须调用 
            名字(实参)
     -->
    <script>
        function fn1() {
            // 往页面中输出内容
            document.write("今天天气真好")
        }
        fn1();

        function fn2(a) {
            document.write(a*2);
        }
        fn2(5);

        var c;
        function fn3(x,y) {
           c = x + y;
        }
        fn3(10,20)
        console.log(c,'c')
        // console.log(typeof(fn3));
    </script>
</body>
</html>