lovecoding
/
W250511


			
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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>
    <style>
        .box{
            color: red;
        }
    </style>
</head>
<body>
    <script>
        // + 左右两边有字符串出现则 变成字符串拼接
        var userName = "张三";

        console.log("恭喜"+userName+"中奖了");

        var a = 10;
        var b = "20";


        console.log(a+b);


        // document.write("恭喜"+userName+"中奖了");

        // 如果用引号表示一段字符串 那么外面用双引号里面用单引号 外面用单引号里面用双引号
        // document.write("<h1 class='box'>hello world</h1>");
        document.write('<h1 class="box">hello world</h1>');


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