开发拾遗

python unicode字符串转成中文

s = 'u6d4bu8bd5u957fu5ea6' s = s.replace('u', '/u') print s.decode('unicode-escape')

php 二进制直接量

$bin = bindec('110011');  $bin = 0b110011;

php foreach list

$arr = [    [1, 2],    [3, 4],];foreach ($arr as list($a, $b)) {    echo $a.$b/n";}

PHP ==和隐式转换

var_dump(md5('240610708') == md5('QNKCDZO'));// true  两个字符串恰好以0e 的科学记数法开头，字符串被隐式转换为浮点数，也就等效于0×10^0var_dump(sha1('aaroZmOk') == sha1('aaK1STfY'));// truevar_dump('0x1234Ab' == '1193131');// true 0x1234Ab转为16进制，php7无此bugvar_dump( 0 == "a" );// truevar_dump( "0" == "a" );// true

== 、switch、in_array 的松比较

// 如果 $name 值为 0，那么它会满足任何一条 caseswitch ($name) {// 使用switch (strval($name)) {    case "danny":        break;    case "eve":        break;}$needle = '1abc'; $haystack = array(1,2,3); var_dump(in_array($needle, $haystack);// true

javascript Date对象的浏览器兼容性问题

// chrome同时支持’-‘和’/’分割日期的时间字符串；safari不支持’-‘分割日期的时间字符串

var arr = "2010-03-15 10:30:00".split(/[- / :]/),    date = new Date(arr[0], arr[1]-1, arr[2], arr[3], arr[4], arr[5]);

javascript 模拟Object.keys()

function keys(obj){  var a = [];  for(a[a.length] in obj);  return a;}

javascript数组去重

function dedupe(array){    return Array.from(new Set(array));}dedupe([1,1,2,3]) //[1,2,3]

工具

// 命令行提示tldr npm install -g tldr

octotree是一款可为 GitHub 和 GitLab 添加侧边栏文件导航的 Chrome 和 Opera 插件

python下载视频工具

Sublime Text3 汉化

// Package Control：Install Package，输入Chinese，选择ChineseLocalization

javascript reduce

arr = [1,2,3,4,5] arr.reduce(function(a,b){ return a*10+b; });//12345var result = [1, 2, 3, 4, 5].reduce(function(prev, curr, index, array){debugger;    prev.push(curr * 2);    return prev;}, []);console.log(result);//[2, 4, 6, 8, 10]//求最大值var max = arr.reduce(function(pre,cur,inde,arr){return pre>cur?pre:cur;});var arr = [ {name: 'brick1'}, {name: 'brick2'}, {name: 'brick3'} ]function carryBricks(arr){  return arr.reduce(function(prev, current, index, array){    if (index === 0){      return current.name;    }    else if (index === array.length - 1){      return prev + ' & ' + current.name;    }    else {      return prev + ', ' + current.name;    }  }, ''); }//brick11, brick12 & brick13//去重var arr = [1, 3, 1, 'x', 'zz', 'x', false, false];var result = arr.reduce(function(prev, curr, i, array) {    var flag = prev.every(function(value) {        return value !== curr;    });    flag && prev.push(curr);    return prev;}, []);console.log(result);

jquery插件

输入提示自动完成插件 tokeninput

tablesorter表格排序

Date.js执行日期/时间的计算

图片裁剪

日期选择插件pickadate.js

javascript刻度条插件

0.1+0.2

Math.round( (.1+.2)*100)/100; //0.3

mysql分解联合查询

select * from teacher join school on teacher.id = school.idjoin course on teacher.id = course.idwhere course.name= 'english'  分解后 select * from course where name = 'english'select * from  school where course_id = 1select * from teacher where school_id in (1,2,3) 

字符串中每个字母重复出现的次数

 var temp = {};   'abcdaabc'.replace(/(/w{1})/g,function($1){        temp[$1] ? temp[$1]+=1 : temp[$1] = 1;    })    console.log(temp) // {a: 3, b: 2, c: 2, d: 1}

composer

PHP HTTP请求套件

实现 Laravel 模型的无限极分类

php一维数组 转 多维数组

$arr = ['a', 'b', 'c', 'd'];$child = array();$res = [];while($v = array_pop($arr)) {    $res = [$v => $child];    $child = $res;}

python中字符串的按位或

a = "1000111000"b = "1000000001"c = int(a, 2) | int(b, 2)print('{0:b}'.format(c))#1000111001

python生成斐波拉契数列

def fib(max):    n, a, b = 0, 0, 1    while n     
php正则匹配
    
$str="{a:1,b:2,c:3}"; preg_match_all('/(/w+):(/d+)/', $str, $matches); $arr = array_combine($matches[1], $matches[2]);#['a'=>1,'b'=>2,'c'=>3]
    
php max/min
    
max(ceil(-0.5), 0) # -0.0max(0, ceil(-0.5)) # 0
    
NaN
    
_.isNaN = function(obj){    return _.isNumber(obj) && obj !==+obj;};
    
Mysql 用 一张表中的数据更新另一张表的数据
    
 update tableA as ca inner join tableB as cb set ca.thumbs=cb.thumbs where cb.courseid=1;24.php后期静态绑定 
    
class A {   public static function get_self() {     return new self();   }      public static function get_static() {     return new static();   } }    class B extends A {} get_class(B::get_self());//A get_class(B::get_static()) //B get_class(A::get_static());//A
    
json_encode输出动态javascript
    
$images = array(  'myself.png' , 'friends.png' , 'colleagues.png' ); $js_code = 'var images = ' . json_encode($images);  echo $js_code; // var images = ["myself.png","friends.png","colleagues.png"]
    
String.fromCharCode
    
var regex_num_set = /(/d+);/g;var str = "Here is some text: 每日一色|蓝白~"str2 = str.replace(regex_num_set, function(_, $1) {  return String.fromCharCode($1);});//"Here is some text: 每日一色|蓝白~"