html从零开始10：注释与常见输出方式，数据类型，typeof运算符，运算符之算术、赋值、比较、布尔运算符【搬代码】

注释与常见输出方式

输出方式

数据类型

typeof运算符

<!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></title>
    <style></style>
</head>
<body>

    <script>
        var name="asd";
        
        var flag=true;
        
        var falgs =false;

        var user={
            name:"小明",
            age:18,
            sex:"男"
        }
        alert( typeof user)
        document.write(typeof user)
        document.write(typeof name)
        document.write(typeof flag)
        console.log(typeof flag)

    </script>
</body>
</html>

运算符之算术运算符

<!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></title>
    <style></style>
</head>
<body>

    <script>
        var name="asd";
        
        var flag=true;
        
        var falgs =false;

        var user={
            name:"小明",
            age:18,
            sex:"男"
        }
        alert( typeof user)
        document.write(typeof user)
        document.write(typeof name)
        document.write(typeof flag)
        console.log(typeof flag)

        var numa = 4;
        var numb = 2;
        var numc = 5;
        document.write(numa+numb);/*自增自减+1或-1*/
        document.write(numb-numa);
        document.write(numa*numb);
        document.write(numb/numa);
        document.write(numc%numa);

        console.log(++numb);/*自增自减+1或-1*/
        console.log(numb++);//4
        console.log(numb);//5
    </script>
</body>
</html>

赋值运算

比较运算

布尔运算