蘑菇博客

一 数组转换为字符串

var w = ['a', 'b', 'c'];
w.toString(); // "a,b,c"
w.join(''); // "abc"
w.join('-'); // "a-b-c"

二 数组添加元素

var w = ['a'];
w.push('b'); // w: ["a", "b"]
w.unshift('c'); // w: ["c", "a", "b"]

三 数组删除元素

var w = ['a', 'b', 'c'];
w.pop(); // c
// w: ['a', 'b'];
w.shift(); // a
// w: ['b'];
delete w[0]

四 合并数组

var w1 = ['a'];
var w2 = ['b'];
var w = w1.concat(w2); // ["a", "b"]

五 查找数组元素

var w = ['a', 'b', 'c'];
w.indexOf('b'); // 1
w.includes('c'); // true
w.find(function(v, i, a) {
    if (v === 'b') {
    // do something
    }
}); // 'b'
w.findIndex(function(v, i, a) {
    if (v === 'b') {
    // do something
    }
}); // 1
w.forEach(function(v, i) { 
    if (v === 'b') { 
    // do something
    }
});

六 反转数组元素

var w = ['a', 'b', 'c'];
w.reverse(); // ["c", "b", "a"]

七 数组切片

var w = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];
w.slice(2, 4); // ["c", "d"]

八 数组元素排序

var w = [4, 'e', 'z', 2, 'a', 'q', 9];
w.sort(); // [2, 4, 9, "a", "e", "q", "z"]
var w = [4, 7, 3, 2, 5, 8, 9];
w.sort(function(a, b) {
    return a - b;
}); // [2, 3, 4, 5, 7, 8, 9]

九 数组筛选

var w = [4, 'e', 'z', 2, 'a', 'q', 9];
var _w = w.filter(function(i) { return i > 0; }); // [4, 2, 9]

一 字符串转换

// int to string
var n = 1; 
n.toString();
String(n);
'' + n

// string to int
var s = '123a';
Number(s);
parseInt(s); // 123 十进制
parseInt(s, 16); // 4666 十六进制
parseFloat(s); // 123
s = '123'; s - 0;

二 字符串分割

var s = 'abcdef-123456';
s.split('-'); // ['abcdef', '123456']
s.split('-', 1); // ['abcdef']

三 字符串查找

var s = 'abcdef';
s.indexOf('e'); // 4
s.lastIndexOf('e'); // 4
s.charAt(4); // e

四 字符串替换

var s = 'abcabc';
s.replace('a', '1'); // "1bcabc"
s.replace(/a/g, '1'); // "1bc1bc"

五 字符串匹配

var s = 'abcdef-123456';
s.match('ef'); // ["ef", index: 4, input: "abcdef-123456", ...]
s.match(/\w+/); // ["abcdef", index: 0, input: "abcdef-123456", ...]
s.match(/\w+/g); // ["abcdef", "123456"]
s.search(/\d+/); // 7

var reg = /\w+/;
reg.exec(s); // ["abcdef", index: 0, input: "abcdef-123456", ...]

六 字符串切割

var s = 'abcdef-123456';
s.substr(1, 4); // "bcde"
s.substring(1, 4); // "bcd"
s.slice(-3, -1); // "45"

七 大小写转换

var s = 'abcDEF-123456';
s.toLowerCase(); // "abcdef-123456"
s.toUpperCase(); // "ABCDEF-123456"

八 去除空格

var s = '  abc  ';
s.trim(); // "abc"

九 附录：字符串对象的所有方法

length
anchor()
big()
blink()
bold()
charAt()
charCodeAt()
concat()
constructor()
endsWith()
fixed()
fontcolor()
fontsize()
includes()
indexOf()
italics()
lastIndexOf()
link()
match()
matchAll()
normalize()
padEnd()
padStart()
repeat()
replace()
search()
slice()
small()
split()
startsWith()
strike()
sub()
substr()
substring()
sup()
toLocaleLowerCase()
toLocaleUpperCase()
toLowerCase()
toString()
toUpperCase()
trim()
trimEnd()
trimLeft()
trimRight()
trimStart()
valueOf()
hasOwnProperty()
isPrototypeOf()

REM 我的电脑

REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{f86fa3ab-70d2-4fc7-9c99-fcbf05467f3a} /f
REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{24ad3ad4-a569-4530-98e1-ab02f9417aa8} /f
REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{d3162b92-9365-467a-956b-92703aca08af} /f
REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{088e3905-0323-4b02-9826-5d99428e115f} /f
REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{3dfdf296-dbec-4fb4-81d1-6a3438bcf4de} /f
REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{B4BFCC3A-DB2C-424C-B029-7FE99A87C641} /f
REG DELETE HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{0DB7E03F-FC29-4DC6-9020-FF41B59E513A} /f

REM Onedrive

%SystemRoot%\SysWOW64\OneDriveSetup.exe /uninstall
REG Delete "HKEY_CLASSES_ROOT\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}" /f
REG Delete "HKEY_CLASSES_ROOT\Wow6432Node\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}" /f

保存为del.cmd，右键管理员权限运行

一、初始化项目

mkdir go-app
cd go-app
go mod init app

二、设置第三方依赖包

go get github.com/go-sql-driver/mysql@v1.4.1
go get github.com/gin-gonic/gin@v1.3.0
go get github.com/gomodule/redigo/redis@v1.7.0

三、开始编码

package main

import (
	"database/sql"
	"log"

	"github.com/gin-gonic/gin"
	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

func main() {
	databaseInit()
	defer db.Close()
	gin.SetMode(gin.ReleaseMode)
	r := gin.Default()
	r.GET("/", IndexAction)
	r.GET("/user/:name", UserAction)
	r.Run()
}

func databaseInit() {
	var err error
	db, err = sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/wordpress")
	if err != nil {
		log.Fatalln(err)
	}
	db.SetMaxIdleConns(500)
	db.SetMaxOpenConns(500)
	err = db.Ping()
	if err != nil {
		log.Fatalln(err)
	}
}

func IndexAction(c *gin.Context) {
	c.JSON(200, gin.H{"message": "index"})
}

func UserAction(c *gin.Context) {
	var ID int
	err := db.QueryRow("SELECT ID FROM wp_users WHERE user_login = ?", c.Param("name")).Scan(&ID)
	if err == nil {
		c.String(200, "Hello %d", ID)
	} else {
		c.String(200, "Hello nobody")
	}
}

四、生成本地依赖

go mod vendor

五、运行

go run -mod=vendor main.go