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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>
- <!--
- 关系运算符：
- > = < <= >=
- 逻辑运算符：
- 1.和 &&:都为真时才为真，一方为假则为假
- 2.或 ||:一方为真则为真,都为假时才为假
- 3.非 ！：返回的是否定值 相反值
- -->
- <script>
- /**
- * = 赋值
- * == 强制转换 相等
- * === 完全相等
- */
- var a = 21;
- var b = a;
- console.log(b);
- if(a === '21') {
- console.log("成功")
- }
- console.log(2<3 || 5<4); // true
- console.log(2>3 || 5<4); // false
-
- console.log(2<3 && 5<4); // false
- console.log(2<3 && 5>4); // true
- console.log(5!=2);//true
- console.log(5!=5);//false
- </script>
- </body>
- </html>
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