摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script> // 声明字符串 var s1 = "hellow huchangxi" var s2 = 'hellow hucha 阅读全文
摘要：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script> var num1 = 3.14 var num2 = 100 console.log(typeof num1,type 阅读全文