lizhenqiu blog

一、中文截取：mb_substr()

mb_substr( $str, $start, $length, $encoding )

$str，需要截断的字符串
$start，截断开始处，起始处为0
$length，要截取的字数
$encoding，网页编码，如utf-8,GB2312,GBK

实例：
复制代码 代码如下:
<?php
$str='脚本之家：http://www.jb51.net';
echo mb_substr($str,0,4,'utf-8');//截取头5个字，假定此代码所在php文件的编码为utf-8
?>
结果显示：脚本之家


二、获取中文长度:mb_strlen()

mb_strlen( $str, $encoding )

$str，要计算长度的字符串
$encoding，网页编码，如utf-8,GB2312,GBK

实例：
复制代码 代码如下:
<?php
$str='脚本之家：http://www.jb51.net';
echo mb_strlen($str,'utf-8');//假定此代码所在php文件的编码为utf-8
?>
结果显示：24

学习时的痛苦是暂时的 未学到的痛苦是终生的

header("Content-type:text/html;charset=utf-8");
//设置北京时间为默认时区
date_default_timezone_set('PRC');

//输出当前时间
echo date("Y-m-d H:i:s",time()); //2016-08-11 10:30:32

//获得当日凌晨的时间戳
$today = strtotime(date("Y-m-d"),time());
echo '<br>';
echo $today; //1470844800
echo '<br>';

//验证当日凌晨的时间戳是否正确
echo date("Y-m-d H:i:s",$today); //2016-08-11 00:00:00
echo '<br>';

//当天的24点时间戳
$end = $today+60*60*24;
//验证当天的24点时间戳是否正确
echo date("Y-m-d H:i:s", $end); //2016-08-12 00:00:00
echo '<br>';

//获得指定时间的零点的时间戳
$time = strtotime('2014-06-06');
echo '<br>';
echo $time; //1401984000
echo '<br>';
//验证是否是指定时间的时间戳
echo date("Y-m-d H:i:s",$time); //2014-06-06 00:00:00

/**
 * @param $lat1
 * @param $lng1
 * @param $lat2
 * @param $lng2
 * @return int
 */
function getDistance($lat1, $lng1, $lat2, $lng2){

    //将角度转为狐度

    $radLat1=deg2rad($lat1);//deg2rad()函数将角度转换为弧度

    $radLat2=deg2rad($lat2);

    $radLng1=deg2rad($lng1);

    $radLng2=deg2rad($lng2);

    $a=$radLat1-$radLat2;

    $b=$radLng1-$radLng2;

    $s=2*asin(sqrt(pow(sin($a/2),2)+cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)))*6378.137;

    return $s;

}

/**
 * @param $lat1
 * @param $lon1
 * @param $lat2
 * @param $lon2
 * @param float $radius  星球半径
 * @return float
 */
function distance($lat1, $lon1, $lat2,$lon2,$radius = 6378.137)
{
    $rad = floatval(M_PI / 180.0);

    $lat1 = floatval($lat1) * $rad;
    $lon1 = floatval($lon1) * $rad;
    $lat2 = floatval($lat2) * $rad;
    $lon2 = floatval($lon2) * $rad;

    $theta = $lon2 - $lon1;

    $dist = acos(sin($lat1) * sin($lat2) +
                cos($lat1) * cos($lat2) * cos($theta)
            );

    if ($dist < 0 ) {
        $dist += M_PI;
    }

    return $dist = $dist * $radius;
}
$lat1 = '31.253411';
$lon1 = '121.518998';

$lat2 = '31.277117';
$lon2 = '120.744587';

echo getDistance($lat1, $lon1, $lat2, $lon2);  // 73.734589823361

echo distance($lat1, $lon1, $lat2, $lon2);   // 73.734589823354

全选（高亮显示）：按esc后，然后ggvG或者ggVG
全部复制：按esc后，然后ggyG
全部删除：按esc后，然后dG

解析：
gg：是让光标移到首行，在vim才有效，vi中无效 
v ： 是进入Visual(可视）模式 
G ：光标移到最后一行 

选中内容以后就可以其他的操作了，比如： 
d  删除选中内容 
y  复制选中内容到0号寄存器 
"+y  复制选中内容到＋寄存器，也就是系统的剪贴板，供其他程序用

func ServerPing(target string) bool  {
    pinger, err := ping.NewPinger(target)
    if err != nil {
        panic(err)
    }

    pinger.Count = ICMPCOUNT
    pinger.Timeout = time.Duration(PINGTIME*time.Millisecond)
    pinger.SetPrivileged(true)
    pinger.Run()// blocks until finished
    stats := pinger.Statistics()

    fmt.Println(stats)
    // 有回包，就是说明IP是可用的
    if stats.PacketsRecv >= 1 {
        return true
    }
    return false
}

func onReady() {
	systray.SetIcon(icoData)
	systray.SetTitle("HTTP Server")
	systray.SetTooltip("服务已最小化右下角, 右键点击打开菜单！")
	mShow := systray.AddMenuItem("显示", "显示窗口")
	mHide := systray.AddMenuItem("隐藏", "隐藏窗口")
	systray.AddSeparator()
	mQuit := systray.AddMenuItem("退出", "退出程序")

	go func() {
		for {
			select {
			case <-mShow.ClickedCh:
				mShow.Disable()
				mHide.Enable()
				ShowConsole()
			case <-mHide.ClickedCh:
				mHide.Disable()
				mShow.Enable()
				HideConsole()
			case <-mQuit.ClickedCh:
				systray.Quit()
			}
		}
	}()

}

func onExit() {
	os.Exit(0)
}

now := time.Now()

// 方法一：

beginningOfDay := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
log.Println("今日已过（纳秒）：", now.UnixNano()-beginningOfDay.UnixNano())
log.Println("今日已过（微秒）：", now.UnixMicro()-beginningOfDay.UnixMicro())
log.Println("今日已过（毫秒）：", now.UnixMilli()-beginningOfDay.UnixMilli())
log.Println("今日已过（秒）：", now.Unix()-beginningOfDay.Unix())

// 方法二：

passedTimeNs := now.UnixNano() - beginningOfDay.UnixNano()
log.Println("今日已过（纳秒）：", passedTimeNs)
log.Println("今日已过（微秒）：", passedTimeNs/1e3)
log.Println("今日已过（毫秒）：", passedTimeNs/1e6)
log.Println("今日已过（秒）：", passedTimeNs/1e9)

package main
// 打开系统默认浏览器

import (
    "fmt"
    "os/exec"
    "runtime"
)

var commands = map[string]string{
    "windows": "start",
    "darwin":  "open",
    "linux":   "xdg-open",
}

func Open(uri string) error {
    run, ok := commands[runtime.GOOS]
    if !ok {
        return fmt.Errorf("don't know how to open things on %s platform", runtime.GOOS)
    }

    cmd := exec.Command(run, uri)
    return cmd.Start()
}

func main() {
    Open("http://baidu.com")
}

package main

import (
    "github.com/labstack/echo"
    "net/http"
)

func HandleWelcome() func(c echo.Context) error {
    return func(c echo.Context) error {
        res := c.Response()
        w := res.Writer
        r := c.Request()
        http.Redirect(w, r, "http://www.baidu.com", http.StatusFound) //跳转到百度
        return nil
    }
}

func main() {
    e := echo.New()
    e.GET("/", HandleWelcome())
    e.Logger.Fatal(e.Start(":1323"))
}

                pickerOptions: {
                    shortcuts: [
                    {
                        text: '今日',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        // start.setTime(start.getTime() - 3600 * 1000 * 24 * 7);
                        picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '昨 天',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 1);
                        end.setTime(end.getTime() - 3600 * 1000 * 24 * 1);
                        picker.$emit('pick', [start, end]);
                        }
                    }, {
                        text: '前 天',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 2);
                        end.setTime(end.getTime() - 3600 * 1000 * 24 * 2);
                        picker.$emit('pick', [start, end]);
                        }
                    }, {
                        text: '大前天',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 3);
                        end.setTime(end.getTime() - 3600 * 1000 * 24 * 3);
                        picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '本周',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            let nowDayOfWeek = now.getDay(); //今天本周的第几天
                            let nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek)
                            const  end = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek))

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 1);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 1);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '上 周',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            let nowDayOfWeek = now.getDay(); //今天本周的第几天
                            let nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek)
                            const  end = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek))

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 1 - 3600 * 1000 * 24 * 7);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 1 - 3600 * 1000 * 24 * 7);
                            picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '本月',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth, 1)
                            const  end = new Date(nowYear, nowMonth + 1, 0)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    }, 
                    {
                        text: '上个月',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年

                            const start = new Date(nowYear, nowMonth-1, 1)
                            const  end = new Date(nowYear, nowMonth, 1)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() -1 + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '上个季度',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年
                            let jd=Math.ceil((nowMonth + 1) / 3)-1;

                            const start = new Date(nowYear, (jd-1)*3, 1)
                            const  end = new Date(nowYear, jd*3, 0)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '本季度',
                        onClick(picker) {
                            let now = new Date(); //当前日期
                            // var nowDayOfWeek = now.getDay(); //今天本周的第几天
                            // var nowDay = now.getDate(); //当前日
                            let nowMonth = now.getMonth(); //当前月
                            let nowYear = now.getFullYear(); //当前年
                            let jd=Math.ceil((nowMonth + 1) / 3);

                            const start = new Date(nowYear, (jd-1)*3, 1)
                            const  end = new Date(nowYear, jd*3, 0)

                            start.setTime(start.getTime() + 3600 * 1000 * 24 * 0);
                            end.setTime(end.getTime() + 3600 * 1000 * 24 * 0);
                            picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '最近一周',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 7);
                        picker.$emit('pick', [start, end]);
                        }
                    },
                    {
                        text: '最近一个月',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 30);
                        picker.$emit('pick', [start, end]);
                        }
                    }, {
                        text: '最近三个月',
                        onClick(picker) {
                        const end = new Date();
                        const start = new Date();
                        start.setTime(start.getTime() - 3600 * 1000 * 24 * 90);
                        picker.$emit('pick', [start, end]);
                        }
                    }],
                    disabledDate:(dd_date_time)=> {
                        return dd_date_time.getTime() > new Date().getTime();
                    }
                },