<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script> var a = 10; //数字 var b = "hello"; //字符串 var c = true; //布尔 var d; //undefined var e = null; //null var f = [1,2,3,4,5,6]; //数组 var g = {}; //对象 console.log(a) console.log(b) console.log(true) console.log(d) console.log(e) console.log(f) console.log(g) </script> </head> <body> </body> </html>
在Chrome和Edge中的显示效果如下
可以看出数字和布尔类型控制台会输出蓝紫色数据，而null和undefined是浅灰色，字符串是黑色
