开发拾遗

判断一个json对象中是否含有某个key

function find (obj, key) {
    if (! typeof obj === 'object') return false;
    if (key in obj) return true;
    for (var k in obj) if find(obj[k], key) return true;
    return false;
}

数组合并

array = [[1,2,3],[4,5,6],[7,8,9]];
array=array.reduce(function(a,b){return a.concat(b)})//[1,2,3,4,5,6,7,8,9]
array.concat.apply([], array);

区间索引

function getRangeIndex(scrollTop) {
    var i=0;
    ranges = [2,3,6,22,88];
    for (;i

快速生成一个数组，数组的元素是前N个自然数

let f = length => Array.from({length}).map((v,k) => k);
let f = length => [...Array.from({length}).keys()]
let fn = len => Object.keys(new Array(len + 1).join(','))

每取10行放到一个新的文件中

with open('file.txt') as reader, open('newfile.txt', 'w') as writer:
    for index, line in enumerate(reader):
        if index % 10 == 0:
            writer.write(line)

按首字母排序

var arr = [9,8,7,6,5,1,'在', '我', '里', '阿','z','a','h','m'];
arr.sort(function(a,b){return a.toString().localeCompare(b)}) //[1, 5, 6, 7, 8, 9, "阿", "里", "我", "在", "a", "h", "m", "z"]

删除字符串的空格

$str='                            Controllable Eu valence for photoluminescence tuning in apatite-typed';
//pC:所有的unicode“other” pZ:所有的unicode“separator” ,所有空格和不可见字符
echo $str = preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u','',$str);//Controllable Eu valence for photoluminescence tuning in apatite-typed

PHP解析JSON得到科学计数法后的int

$json = '{"number": 12345678901234567890}';
var_dump(json_decode($json,1));//[ "number" => 1.2345678901235e+19]
var_dump(json_decode($json,1, 512, JSON_BIGINT_AS_STRING));//["number" => "12345678901234567890"]
//http://cn2.php.net/manual/zh/function.json-decode.php

MySQL中所有数据库的数据大小

SELECT table_schema, (
(
SUM( DATA_LENGTH ) + SUM( INDEX_LENGTH )
) /1024 /1024
) AS datasize
FROM  `TABLES`
GROUP BY table_schema
LIMIT 0 , 30

合并数组

//一般会用Array.prototype.concat()函数，但不适合来合并两个大型数组，会消耗大量内存来存储新创建的数组。可用Array.prototype.push来替代创建一个新数组，可减少内存的使用。
var array1 = [1,2,3];
var array2 = [4,5,6];
console.log(array1.push.apply(array1, array2)); // [1,2,3,4,5,6];
console.log(array1.push.call(array1, array2)); // [1,2,3,[4,5,6]];

php上传文件

$tmp_name='test.jpg';
    if(version_compare(phpversion(),'5.5.0') >= 0 && class_exists('CURLFile')){
        $fields['file'] = new CURLFile(realpath($tmp_name));
    }else{
        $fields['file'] = '@'.$tmp_name;//加@符号curl就会把它当成是文件上传处理
    }

php stdclass

$tanteng = new stdClass();
$tanteng->name = 'tanteng';
$tanteng->email = 'xxx@qq.com';
 //把定义的对象『转换』成数组
$info = get_object_vars($tanteng);
$user = new stdClass();
$user->name = 'gouki';
$user->hehe = 'hehe';
$myUser = $user;
$myUser->name = 'flypig';
 //$myUser的属性确实改变了$user声明的stdClass属性。而如果$user是一个数组，赋值给$myUser，那就拷贝了一个副本给$myUser，这样增大系统开销
print_r($user);
 
print_r($myUser);
 
print_r($user);

PHP浮点数运算精度

$a = 69.1;
 
$b = $a*100;
 
$c = $b-6910;//-9.0949470177293E-13

$c = round($b)-6910;
$x = 8 - 6.4;  // which is equal to 1.6
$y = 1.6;
var_dump($x == $y); // is not true
var_dump(round($x, 2) == round($y, 2)); // this is true
$a = intval( 0.58*100 );//57
 
$b = 0.58*100;
$a = intval( (0.58*1000)/10 );//58
intval( round(0.58*100 ));//58

防止浏览器屏蔽window.open

点击

修改session_id的保存位置

session_set_cookie_params(0,‘/’,‘testdomain’);
session_start();//开启session
echo ‘Old Session id:’.session_id().‘
’;
session_regenerate_id(true);//重置session_id，并使原session无效
echo ‘New Session id:’.session_id().‘
’;
//echo session_id()失效
setcookie(session_name(),session_id(),0,‘/’,‘testdomain’);//手动更新session_id

CRUL命令简单分析请求细节所占用的时间

curl -o /dev/null -s -w %{http_code}:%{time_namelookup}:%{time_redirect}:%{time_pretransfer}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download} www.baidu.com
//这个例子是分析一次百度的请求各个参数：http状态码、DNS解析时间、重定向时间、从开始到准备传输的时间、TCP连接时间、开始传输时间、总时间、下载速度CURL文档：https://curl.haxx.se/docs/manpage.html

php上周时间

echo '
上周起始时间:
';
echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1-7,date("Y"))),"\n";
echo date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"))),"\n";

echo date("Y-m-d",strtotime('-1 week last monday'))." 00:00:00";
echo date("Y-m-d",strtotime('last sunday'))." 23:59:59";
//当前时间的上一周时间  每周时间固定为7天
date('Y-m-d', strtotime('-1 week'))
//如果当前日期为2016-5-31, 用date('Y-m-d', strtotime('-1 month'))会产生错误。因为这里把 -1 month按照-30 days来算
date('Y-m-d', strtotime('2016-05-31 -1 month')) = 2016-05-01
date('Y-m-d', strtotime('2016-01-31 +1 month')) = 2016-03-02
//如果需要取当前月的前后月份的话，需要小心，正确做法可以改为
date('m', strtotime(date('Y-m-1').' -1 month'))
date('m', strtotime(date('Y-m-1').' +1 month'))

{ "a":"1","b":"2"} 变成 "a:1;b:2"

var obj = {"a":"1","b":"2","c":"3"};
var str = $.map(obj,function(n,index){return ''+index+':'+n;}).join(';');//"a:1;b:2;c:3"
var str = JSON.stringify(obj).replace(/"|{|}/g, "").replace(/,/g, ";")
Object.keys({"a":"1","b":"2"}).map(function(key){return key+':'+info[key]}).join(';');

python格式化

ips = (
    (1, '10.121.1.1:4730'),
    (2, '127.0.0.1:4730'),
    (3, '127.0.0.1:4730')
)

dic = {}
for v, k in ips:
    dic.setdefault(k, []).append((v, k))

print dic
{
    '10.121.1.1:4730':
        [(1, '10.121.1.1:4730')], 
    '127.0.0.1:4730':
        [(2, '127.0.0.1:4730'), (3, '127.0.0.1:4730')]
}

PHP生成连续数据

$numbers = array(0, 1, 3, 5, 6, 8, 10);
sort($numbers);
$new = range(array_shift($numbers),end($numbers));//[0 1 2 3 4 5 6 7 8 9 10]
$a = [0,1,3,5,6,8,10];//原始数据
sort($a);
range(array_shift($a),array_pop($a));

javascript对象复制

function clone(e) {
    var t = {};
    for (var n in e) e.hasOwnProperty(n) && (t[n] = e[n]);
    return t;
}

过滤掉emoji表情

function $(selector, context) {
        context = context || document;
        var elements = context.querySelectorAll(selector);
        return Array.prototype.slice.call(elements);
    };

jquery对象对比,开发中要尽量先保存创建的jQuery对象，然后多次使用

var elem1 = $("#navList li");
var elem2 = $("#navList li");
elem1 ==elem2;//false
//应该比较dom本身不是 jQuery对象
$('div') === $('div') //false
$('div')[0] === $('div')[0]//true

for 循环和异步调用的问题

var arr = ['A1','A2','A100','A7','B2','A10','A14','B12','C1','C10','C5']
arr.sort(function(a, b) {
  var ret = a.charCodeAt(0) - b.charCodeAt(0); // 首字母处理
  if (ret == 0) {
    ret = +a.slice(1) - +b.slice(1); // 数字处理
  }
  return ret;//["A1", "A2", "A7", "A10", "A14", "A100", "B2", "B12", "C1", "C5", "C10"]
});

JSON.parse转换报错

var getValue = function (objStr) {
    return new Function("return " + objStr)()
}
// 调用
var res1 = getValue('{"foo" : 1, }')//Object {foo: 1}
JSON.parse(res1);

javascript正则替换

var str = 'abc{xdf}efg{dfg}ijk{232}';
var arr = ['d', 'h', 'l'];
var result = str.match(/\{.*?\}/g);
for (var i = 0; i 

javascript闭包

function Score(){
    this.scores = [];
}
Score.prototype.add = function(score){
    this.scores.push(score);
};
Score.prototype.showAverage = function(){
    let sum = this.scores.reduce(function(pre,cur){
        return pre+cur;
    });
    console.log(sum*1.0/this.scores.length);
};
let scores = [90,80,70];
let score1 = new Score();
scores.forEach(score1.add);//scores.forEach(score1.add.bind(score1));
scores.forEach(function(score) {
    score1.add(score);
});
score1.showAverage();

javascript array reduce()

arr.reduce(function (pre, cur, index) {
    if (index >= 3) {
        return pre;
    }
    return pre + cur;
}, initVal);

javascript 汉字占2字节

function getLength(str) {
    return str.replace(/[^ -~]/g, 'AA').length;
}

function limitMaxLength(str, maxLength) {
    var result = [];
    for (var i = 0; i 

隐藏手机号

echo substr_replace ('13412343312','****',3,4) ;//134**3312

javascript数组降维

var flatten = function(array) {
    return array.reduce(function(previous, i) {
        if (Object.prototype.toString.call(i) !== '[object Array]') {
            return (previous.push(i), previous);
        }
        return (Array.prototype.push.apply(previous, flatten(i)), previous);
    }, []);
};
undefined
flatten([[1, 2],[3, 4, 5], [6, 7, 8, 9,[11,12,[12,13,[14]]]],10]);
//[1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 12, 13, 14, 10]
[[0, 1], [2, 3], [4, 5]].reduce(function(a, b) {
    return a.concat(b);
});

获取content-type

//获取content-type
function getContentType($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_exec($ch);
    $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
    return $contentType;
}
 
//获取url后缀
function getUrlExtension($url)
{
    $parseurl = parse_url($url);
    $extension = pathinfo($parseurl['path'], PATHINFO_EXTENSION);
    return $extension;
}

PHP随机合并数组并保持原排序

//随机合并两个数组元素，保持原有数据的排序不变（即各个数组的元素在合并后的数组中排序与自身原来一致）
function shuffleMergeArray() {
    $mergeArray = array();
    $sum = count($array1) + count($array2);
    for ($k = $sum; $k > 0; $k--) {
        $number = mt_rand(1, 2);
        if ($number == 1) {
            $mergeArray[] = $array2 ? array_shift($array2) : array_shift($array1);
        } else {
            $mergeArray[] = $array1 ? array_shift($array1) : array_shift($array2);
        }
    }


    return $mergeArray;
//合并前的数组：
$array1 = array(1, 2, 3, 4);
$array2 = array('a', 'b', 'c', 'd', 'e');

//合并后的数据：
$mergeArray = array (
  0 => 'a',
  1 => 1,
  2 => 'b',
  3 => 2,
  4 => 'c',
  5 => 'd',
  6 => 3,
  7 => 4,
  8 => 'e',
)

仿知乎复制文本自带版权声明

document.body.addEventListener('copy', function (e) {
    if (window.getSelection().toString() && window.getSelection().toString().length > 42) {
        setClipboardText(e);
        alert('商业转载请联系作者获得授权，非商业转载请注明出处，谢谢合作。');
    }
});
 
function setClipboardText(event) {
    var clipboardData = event.clipboardData || window.clipboardData;
    if (clipboardData) {
        event.preventDefault();
 
        var htmlData = ''
            + '著作权归作者所有。
'
            + '商业转载请联系作者获得授权，非商业转载请注明出处。
'
            + '作者：DIYgod
'
            + '链接：' + window.location.href + '
'
            + '来源：Anotherhome

'
            + window.getSelection().toString();
        var textData = ''
            + '著作权归作者所有。\n'
            + '商业转载请联系作者获得授权，非商业转载请注明出处。\n'
            + '作者：DIYgod\n'
            + '链接：' + window.location.href + '\n'
            + '来源：Anotherhome\n\n'
            + window.getSelection().toString();
 
        clipboardData.setData('text/html', htmlData);
        clipboardData.setData('text/plain',textData);
    }
}

根据用户积分判断等级

//lv1:1~50
//lv2:51~110
//lv3:111~180
//lv4:181~260
function getLevel($point) {
    $level = 0;
    while($point >= 0) {
        $point -= 50 + $level++ * 10;
    }
    return $level;
}

0000000序列递增

for ($i = 0; $i 0; $j--) { 
        $zero .= 0;
    }
    echo $zero.$i.'
';
}
for (var i = 0 ; i  0; j--) {
    zero += "0";
  }
  console.log(zero + i);
}
for ($i=0;$i

判断远程图片是否存在

function exist_file($url){ 
$opts=array( 
'http'=>array( 
'method'=>'HEAD', 
'timeout'=>2 
)); 
@file_get_contents($url,false,stream_context_create($opts)); 
if ($http_response_header[0] == 'HTTP/1.1 200 OK') { 
return true; 
} else { 
return false; 
} 
}

检测函数类型

function getType(value){  //基本上可以返回所有的类型，不论你是自定义还是原生
    return Object.prototype.toString.call(value).match(/\s{1}(\w+)/)[1];
}
let obj = new Object();
console.log(getType(obj)); //"Object"

moment.js时间处理

var a = moment([2016, 0, 15]);
var b = moment([2016, 7, 31]);
var diff = b.diff(a, 'months');

var diffMonths = Array
        .apply([], new Array(diff + 1))
        .map(function(item, index) {
            return a.clone().add(index, 'month').format('YYYY-MM');
        });

console.log(diffMonths);//["2016-01", "2016-02", "2016-03", "2016-04", "2016-05", "2016-06", "2016-07"]

php中文正则匹配

php中文正则匹配$str = "one中国你好two";
$preg = "/\P{Han}+/u";
$result = preg_replace($preg, '', $str);
var_dump($result); //string(12) "中国你好" p小写是匹配汉字，P大写是匹配非汉字

生成6位的数字验证码

console.log(('000000' + Math.floor(Math.random() * 999999)).slice(-6));
console.log(Math.random().toString().slice(-6));
console.log(/\d{6}/.exec(Math.random())[0])
console.log('' + Math.floor(Math.random() * 999999));

16进制颜色代码生成

(function(){
return '#'+('00000'+(Math.random()*0x1000000

php 模拟 tail -f

$handle = popen("tail -f /var/log/nginx/access.log 2>&1", 'r');
     while(!feof($handle)) {
     $buffer = fgets($handle);
     echo "$buffer\n";
     flush();
}
pclose($handle);

mysql distinct

test表的结构
id test1 test2
1 a 1
2 a 2
3 a 3
4 a 1
5 b 1
6 b 2
7 b 3
8 b 2
select distinct test1 from test
test1
a
b
select distinct test1, id from test
test1 id
a 1
a 2
a 3
a 4
b 5
b 6
b 7
b 8
SELECT id, group_concat( DISTINCT test1 ) t FROM test GROUP BY test1
id t
1 a
5 b

php下载文件

try {
    $client = new \GuzzleHttp\Client($url,[
    'curl.options' => [
        CURLOPT_SSL_VERIFYPEER=>2,
        CURLOPT_SSL_VERIFYHOST=true,
    ]
]);
    $data = $client->request('get','http://xxxx')->getBody()->getContents();
    Storage::disk('local')->put('filename', $data);
} catch (\GuzzleHttp\RequestException $e) {
    echo 'fetch fail';
}

javascript sort 排序

var  arr=[3,4,6,21,2,3,4,1,2,9,6,3,4,5,6,7,2,3];
arr.sort(function(a,b){
        return  a>b;
});
console.log(arr);//[9, 3, 2, 3, 2, 3, 2, 1, 3, 4, 4, 4, 5, 6, 6, 6, 7, 21]

var  arr=[3,4,6,21,2,3,4,1,2,9,6,3,4,5,6,7,2,3];
arr.sort(function(a,b){
        return  a-b;
});
console.log(arr);//[1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6, 6, 6, 7, 9, 21]
var  arr=[
        {name:"one",age:10},
        {name:"two",age:40},
        {name:"three",age:30},
        {name:"four",age:90},
        {name:"five",age:60}
];
arr.sort(function(a,b)  {
        return  a.age-b.age;
});
console.log(arr);

javascript date

new Date(2016,1,31) > new Date(2016, 2, 1)//true
//month 从 0 开始算 new Date(2016,1,31) == 2016 年 2 月 31 日 然而 2 月只有 29 天 so 
new Date(2016,1,31) == 2016 年 3 月 2 日
new Date(2016,1,30) > new Date(2016, 2, 1)//false

javascript lastIndex

function filtrate() { 
var newArr = [], reg = /^\s*$/g, 
str = "baidu,google, , ,baidu,google,bg"; 
arr = str.split(','); 
for (var i = 0; i 

微信浏览器禁止页面下拉查看网址

var overscroll = function(el) {
  el.addEventListener('touchstart', function() {
    var top = el.scrollTop
      , totalScroll = el.scrollHeight
      , currentScroll = top + el.offsetHeight;
    //If we're at the top or the bottom of the containers
    //scroll, push up or down one pixel.
    //
    //this prevents the scroll from "passing through" to
    //the body.
    if(top === 0) {
      el.scrollTop = 1;
    } else if(currentScroll === totalScroll) {
      el.scrollTop = top - 1;
    }
  });
  el.addEventListener('touchmove', function(evt) {
    //if the content is actually scrollable, i.e. the content is long enough
    //that scrolling can occur
    if(el.offsetHeight 

laravel 为 VerifyCsrfToken 添加过滤条件

//修改 app/Http/Middleware/VerifyCsrfToken.php

switch 字符串和数字会隐式转换比较

$string="2string";

switch($string)
{
    case (string) 1:
        echo "this is 1";
        break;
    case (string) 2:
        echo "this is 2";
        break;
    case '2string':
        echo "this is a string";
        break;
}

输出调试信息

function log(msg){
    var $body = document.querySelector('body');
    
    if( !$body.querySelector('.info_wz_852') ){
        $body.innerHTML += '
';
    }
        
    var $info = $body.querySelector('.info_wz_852');
    var date = new Date(),
        minute = ('00'+date.getMinutes()).slice(-2),
        second = ('00'+date.getSeconds()).slice(-2);
    
    try{
        throw new Error();
    }catch(e){
        var loc = (e.stack.replace(/Error\n/).split(/\n/)[1]).replace(/^(\s|\u00A0)+/,'').replace(/(\s|\u00A0)+$/,'');
            
        // var arr = loc.split(':'),
        //     col = parseInt(arr.pop()),
        //     line = parseInt(arr.pop());
    
        $info.innerHTML += '
['+minute+':'+second+'] '+loc+'
'+msg+'

';
    }
}

对象数组互转方法

/**
     * 数组转换对象
     *
     * @param $arr 数组
     * @return object|void
     */
    public function arrayToObject($arr)
    {

        if (gettype($arr) != 'array') return;
        foreach ($arr as $k => $v) {
            if (gettype($v) == 'array' || getType($v) == 'object')
                $e[$k] = (object)$this->arrayToObject($v);
        }
        return (object)$e;
    }

    /**
     * 对象转换数组
     *
     * @param $e StdClass对象实例
     * @return array|void
     */
    public function objectToArray($s)
    {
        $s = (array)$s;
        foreach ($s as $k => $v) {
            if (gettype($v) == 'resource') return;
            if (gettype($v) == 'object' || gettype($v) == 'array')
                $e[$k] = (array)$this->objectToArray($v);
        }
        return $e;
    }

javascript数组随机

Array.prototype.shuffle = function(n) {
  var len = this.length , num = n?Math.min(n,len):len,arr = this.slice(0)
  arr.sort(function(a,b){
     return Math.random()-0.5
  })
  return arr.slice(0,num-1)
}

php生成不重复字符串

//循环创建1万个随机账号，0碰撞，10万大约0-3个碰撞，足够应付未来数十亿级PV
function genUserNumber()
{
    $chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $username = "";
    for ( $i = 0; $i 

一个操作中对 Redis 服务器执行多个命令

Redis::pipeline(function ($pipe) {
  for ($i = 0; $i set("key:$i", $i);
  } 
});

中文拼音排序

from pypinyin import lazy_pinyin

chars = ['鑫','鹭','榕','柘','珈','骅','孚','迦','瀚','濮','浔','沱','泸','恺','怡','岷','萃','兖']

chars.sort(key=lambda char: lazy_pinyin(char)[0][0])

print([lazy_pinyin(char) for char in chars])
print(chars)
[['cui'], ['fu'], ['hua'], ['han'], ['jia'], ['jia'], ['kai'], ['lu'], ['lu'], ['min'], ['pu'], ['rong'], ['tuo'], ['xin'], ['xun'], ['yi'], ['yan'], ['zhe']]
['萃', '孚', '骅', '瀚', '珈', '迦', '恺', '鹭', '泸', '岷', '濮', '榕', '沱', '鑫', '浔', '怡', '兖', '柘']

php 金额每三位加逗号分隔

//money_format
>>> strrev(implode(',', str_split(strrev('434353222323443'), 3)) )
=> "434,353,222,323,443"

php时间格式化

function getDiffTime($timestamp) 
{
    $datetime = new DateTime(date('Y-m-d H:i:s', $timestamp));
    $datetime_now = new DateTime();
    $interval = $datetime_now->diff($datetime);
    list($y, $m, $d, $h, $i, $s) = explode('-', $interval->format('%y-%m-%d-%h-%i-%s'));
    if ((($result = $y) && ($suffix = '年前')) ||
        (($result = $m) && ($suffix = '月前')) ||
        (($result = $d) && ($suffix = '天前')) ||
        (($result = $h) && ($suffix = '小时前')) ||
        (($result = $i) && ($suffix = '分钟前')) ||
        (($result = $s) && ($suffix = '刚刚'))) {
        return $suffix != '刚刚' ? $result . $suffix : $suffix;
    }
}

html写入word

function word($data,$fileName=''){ 
if(empty($data)) return ''; 
$data=''.$data.''; 
if(empty($fileName)) $fileName=date('YmdHis').'.doc'; 
$fp=fopen($fileName,'wb'); 
fwrite($fp,$data); 
fclose($fp); 
} 
$str = '
hello daye
'; 
word($str); 

一行代码可以看到所有页面元素

[].forEach.call($$("*"),function(a){a.style.outline="1px solid #"+(~~(Math.random()*(1
https://segmentfault.com/a/11...
http://blog.tanteng.me/2015/1...
http://joebon.cc/date-cross-b...
https://segmentfault.com/a/11...
https://segmentfault.com/q/10...
https://www.zhihu.com/questio...
http://t.cn/RqgIMWa
http://t.cn/h4tDfg
http://div.io/topic/1610
https://www.talkingcoder.com/...
http://www.w3cfuns.com/notes/...
http://www.cnblogs.com/shocke...
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