lovecoding
/
web0715


			
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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>
    <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Operator_precedence">运算符优先级</a>
    <a href="https://www.runoob.com/js/js-reserved.html">JavaScript 关键字保留子</a>
    <div class="box"></div>
    <script>
        var str = "hello";
        var str1 = "<div class='box'></div>";
        var str2 = '<div class="box"></div>';

        var num;
        console.log(num);

        num2 = 10;
        console.log(num2);

        //1+2 = 3
        // 1+"hell"

        // var a = 1;
        // var b = 2;

        // var a = 1,b=2;

        // var a = true,b;

        // \反斜线开头的表示转义字符 \n 回车
        console.log("hello\nworld");
        console.log("he\"llo")
        console.log("hel\'lo");

        //NaN    not a number 

        // var str11 = "a";
        // var str12 = "b";
        var str11 = "11";
        var str12 = "2";
        console.log(str11<str12);

        var num = 1;
        num *= 10;


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