javascript

一个页面有相同ID元素的情况分析

经常会遇到一个页面中有相同定义相同id的情况，从道理上来说，id应该是这个页面中某个元素的唯一标识，所以不应该出现有相同id的情况，否则会产生意想不到的结果。而且各个浏览器的表现也是不一样的。我只做了ie6，chrome和firefox的测试。
代码如下：

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<div id="a"><input type="text" id="aa" value="aaaaaaaa"/></div>  
<div id="b"><input type="text" id="aa" value="bbbbbbbbb"/></div>  
<input type="button" onclick="show()" value="click here" />  
<script type="text/javascript" src="http://qustliuyongjie.blog.163.com/blog/jquery.min.js"></script>  
<script type="text/javascript">  
function show(){  
    alert($('#aa').val());（情况一）  
    alert($('#a #aa').val());（情况二）  
    alert($('#b #aa').val());（情况二）  
}  
</script>

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javascript

JQuery脚本-通过禁用按钮防止表单重复提交 

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<script language="javascript">   
<!--   
var submitcount=0;   
function submitOnce (form){   
  if (submitcount == 0){   
     submitcount++;   
     return true;   
  } else{   
    alert("正在操作，请不要重复提交，谢谢！");   
    return false;   
  }   
}   
//-->   
</script>   
  
<form name="the_form" method="post" action="" onSubmit="return submitOnce(this)">   
<input name="text" type="text" id="text" />   
<input name="cont" value="提交" type="submit">   
</form>

在上例中，如果用户已经单击“提交”按钮，该脚本会自动记录当前的状态，并将submitcount变量自加1，当用户试图再次提交时，脚本判断submitcount变量值非零，提示用户已经提交，从而避免重复提交表单。

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php

php中preg正则函数使用

1.preg_match和preg_match_all的区别
preg_match和 preg_match_all区别是preg_match只匹配一次。而preg_match_all全部匹配，直到字符串结束。例：

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<?php  
//注：正则 /a.+?e/ 是非贪婪模式(因为量词‘+’后面加上了‘?’)，如果使用 /a.+?e/U 则变回了贪婪模式  
preg_match("/a.+?e/","abcdefgabcdefgabcdefg",$out1);  
preg_match_all("/a.+?e/","abcdefgabcdefgabcdefg",$out2);  
var_dump($out1);  
var_dump($out2);  
/* 
输出： 
array (size=1) 
  0 => string 'abcde' (length=5) 
 
array (size=1) 
  0 => 
    array (size=3) 
      0 => string 'abcde' (length=5) 
      1 => string 'abcde' (length=5) 
      2 => string 'abcde' (length=5) 
 */  
?>

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php

preg_match_all使用实例 

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<?php  
    $str = <<<EOT  
    <!DOCTYPE html>
    <html>
      <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>微信公众平台</title>
        <link href="https://res.wx.qq.com/mpres/htmledition/images/favicon1e5b3a.ico" rel="Shortcut Icon">
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/mpres/htmledition/style/base/layout_head1f56cd.css" />
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/mpres/htmledition/style/base/base1f8f18.css" />
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/mpres/htmledition/style/base/lib1ec5f7.css" />
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/mpres/htmledition/style/page/setting/setting_common1ec5f7.css" />
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/mpres/htmledition/style/page/setting/setting_index1f46ee.css" />
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/mpres/htmledition/style/jquery.Jcrop.min1e5b3a.css" />
        <link rel="stylesheet" type="text/css" href="https://res.wx.qq.com/c/=/mpres/htmledition/style/widget/upload1f8f05.css,/mpres/htmledition/style/widget/processor_bar1ec663.css" />
      </head>
      
      <body class="zh_CN">
        <div class="main_bd">
          <div class="account_setting_area" id="settingArea">
            <ul>
              <li class="account_setting_item">
                <h4>名称</h4>
                <div class="meta_opr"></div>
                <div class="meta_content">青鸢</div>
              </li>
              <li class="account_setting_item">
                <h4>头像</h4>
                <div class="meta_opr">
                  <a id="changeHeadImg" href="javascript:;">修改头像</a>
                  <p class="desc">(一个月内只能申请修改一次)</p>
                </div>
                <div class="meta_content">
                  <img class="avatar" src="/misc/getheadimg?token=1388&fakeid=3084&r=269391" />
                </div>
              </li>
              <li class="account_setting_item">
                <h4>登录邮箱</h4>
                <div class="meta_opr">
                  <p>
                    <a href="/acct/updateboundemail?t=setting/bind-email&action=bind&token=138856269&step=1&lang=zh_CN">修改</a>
                  </p>
                  <p class="desc">(一个月内只能申请修改一次)</p>
                </div>
                <div class="meta_content">aaaa@163.com</div>
              </li>
              <li class="account_setting_item">
                <h4>原始ID</h4>
                <div class="meta_opr"></div>
                <div class="meta_content">
                  <span>gh_00aec11d9</span>
                </div>
              </li>
              <li class="account_setting_item">
                <h4>微信号</h4>
                <div class="meta_opr"></div>
                <div class="meta_content">
                  <span>aaaa_163</span>
                </div>
              </li>
              <li class="account_setting_item">
                <h4>类型</h4>
                <div class="meta_opr"></div>
                <div class="meta_content">订阅号</div>
              </li>
              <li class="account_setting_item">
                <h4>认证情况</h4>
                <div class="meta_opr verify">
                  <a href="javascript:;" id="Js_weiboVerify">关联微博认证</a>
                  <a href="/merchant/store?action=detail&t=wxverify/detail&info=verify&lang=zh_CN&token=1388">申请微信认证</a>
                </div>
                <div class="meta_content">未认证</div>
              </li>
              <li class="account_setting_item">
                <h4>介绍</h4>
                <div class="meta_opr">
                  <p>
                    <a id="modifyUserInfo" href="javascript:;" class="">修改</a>
                  </p>
                  <p class="desc">(一个月内功能介绍只能申请修改一次)</p>
                </div>
                <div class="meta_content">php学习交流</div>
              </li>
              <li class="account_setting_item">
                <h4>所在地址</h4>
                <div class="meta_opr">
                  <a href="/cgi-bin/settingpage?action=sosomap&lang=zh_CN&token=138856269">设置</a>
                </div>
                <div class="meta_content"></div>
              </li>
              <li class="account_setting_item">
                <h4>二维码</h4>
                <div class="meta_opr">
                  <a id="more_size" href="javascript:;">更多尺寸</a>
                </div>
                <div class="meta_content">
                  <a target="_blank" class="verifyInfo" title="点击下载" href="/misc/getqrcode?fakeid=3088921&token=1388&style=1&action=download">
                    <img src="/misc/getqrcode?fakeid=3084389217&token=1388&style=1" width="150" />
                  </a>
                </div>
              </li>
            </ul>
          </div>
        </div>
        </div>
        </div>
        <div class="faq">
          <ul class="links">
            <li class="links_item no_extra">
              <a href="http://crm2.qq.com/page/portalpage/wpa.php?uin=40012345&f=1&ty=1&ap=000011:400792:|m:12|f:400792:m:12"
              target="_blank">在线客服</a>
            </li>
            <li class="links_item">
              <a href="http://kf.qq.com/product/weixinmp.html" target="_blank">客服中心</a>
            </li>
          </ul>
          <p class="tail">反馈官号weixingongzhong</p>
        </div>
        </div>
      </body>
    </html> 
    EOT;  
      
    preg_match_all("/<li class=\"account_setting_item\">\s*?<h4>(.*?)<\/h4>[\s\S]*?<div class=\"meta_content\">([\s\S]*?)<\/div>/",$str,$out);  
    //var_dump($out);die;  
    foreach ( $out [1] as $key=>$val ) {  
        $arr [] = array('key'=>$val,'val'=>trim ( $out[2][$key] ));  
    }  
    if (count($arr) > 0) {  
        foreach ($arr as $k=>$v){  
            switch ($v['key']){  
                case '原始ID':  
                    $arr['openid'] = preg_replace("/<span>(.*?)<\/span>/", "$1", $v['val']);  
                    break;  
                case '微信号':  
                    $arr['account'] = preg_replace("/<span>(.*?)<\/span>/", "$1", $v['val']);  
                    break;  
                case '名称':  
                    $arr['wx_name'] = $v['val'];  
                    break;  
                case '类型':  
                    $arr['type'] = ($v['val']=='服务号') ? 1 : 0;  
                    break;  
                case '认证情况':  
                    $arr['verify'] = strpos($v['val'],"icon_verify_checked")?1:2;  
                default:  
                    $arr[$v['key']] = $v['val'];  
            }  
        }  
        //return $arr;  
    }     
      
    var_dump($arr);die;   
?>

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mongodb

Mongodb定时备份脚本和清除脚本

Mongodb用的是可以热备份的mongodump和对应恢复的mongorestore,在linux下面使用shell脚本写的定时备份，代码如下

1.定时备份

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#!/bin/bash  
sourcepath='/usr'/bin   #mongodump命令所在路径  
targetpath='/var/lib/mongo/mongobak'   #备份存放位置  
nowtime=$(date +%Y%m%d)  
   
start()  
{  
  ${sourcepath}/mongodump -u username -p password -d dbname --host 127.0.0.1 --port 27017 --out ${targetpath}/${nowtime}  
}  
execute()  
{  
  start  
  if [ $? -eq 0 ]  
  then  
    echo "back successfully!"  
  else  
    echo "back failure!"  
  fi  
}  
   
if [ ! -d "${targetpath}/${nowtime}/" ]  
then  
 mkdir ${targetpath}/${nowtime}  
fi  
execute  
echo "============== back end ${nowtime} =============="

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