摘要：
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>String对象</title></head> <body> <script> //构建String对象 //赋值 var str1 = "haol" //输出类 阅读全文
摘要：
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <title>九九乘法表</title></head> <body> <script> for (var a = 1; a < 10; a++) { for (var b = 阅读全文