随笔,发现的技巧，有用的函数

取得domobj的实际高度

domobj.clientHeight||domobj.documentElement.clientHeight;

使用socket下载一个url,默认自动尝试三次.

private function getSContent($url,$retry=0,$maxRetry=3){
  $url_param = parse_url($url);
  if($retry>=$maxRetry){
   echo "Download $url failed!";
   return false;
  }else{
   $fp = fsockopen($url_param['host'], 80, $errno, $errstr, 30);
   if (!$fp) {
    echo $k." error($retry)!/r/nTry again after 15 seconds./r/n";
    sleep(15);
    return $this->getSContent($url,$retry+1);
   } else {
    try{
     $out = "GET ".$url_param['path'].'?'.$url_param['query']." HTTP/1.1/r/n";
     $out .= "Accept: */*/r/n";
     $out .= "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)/r/n";
     $out .= "Host: ".$url_param['host']."/r/n";
     $out .= "Connection: Close/r/n/r/n";

     $contents = "";
     //echo $out;
     fwrite($fp, $out);
     while (!feof($fp)) {
      $contents .= fgets($fp, 128);
     }
     fclose($fp);
     //去掉http头
     $contents = substr($contents,strpos($contents,"/r/n/r/n")+4);
     return $contents;
    }catch(Exception $e){
     echo $e->getMessage()."/r/nRead content error!/r/nTry again after 15 seconds./r/n";
     sleep(15);
     return $this->getSContent($url,$retry+1);
    }
   }
  }
}

如果是linux服务器就可以做到，一下列出部分供你参考。
1. 取出系统Kernel版本：
$sys_host_name = file("/proc/sys/kernel/hostname");
$sys_ostype = file("/proc/sys/kernel/ostype");
$sys_osrelease = file("/proc/sys/kernel/osrelease");
$sys_version_time = file("/proc/sys/kernel/version");

2. 取出CPU信息
$cpu_info = file("/proc/cpuinfo");

3. 取出系统内存和交换分区的信息
$memory_info = file("/proc/meminfo");
$meminfo = explode(" ", $memory_info[1]);

4. 取出PS进程信息，以推算出CPU和MEM的使用率
exec("ps -aux", $ps_info_result);
for ($i = 0; $i < count($ps_info_result); $i++) {
list($user[$i], $pid[$i], $cpu[$i], $mem[$i], $vsz[$i], $rss[$i], $tty[$i], $stat[$i], $start[$i], $time[$i], $command[$i]) = split(" +", $ps_info_result[$i]);
//取出CPU用的总数(百分比)
$cpu_use_total = $cpu_use_total + $cpu[$i];
//取出MEM用的总数(百分比)
$mem_use_total = $mem_use_total + $mem[$i];
//取出MEM用的总数(KB)
$rss_use_total = $rss_use_total + $rss[$i];
}

javascript:支持firefox和ie的淡影淡出效果

<img id="aa" src="http://www.google.cn/images/nav_logo3.png" style="position:absolute;left:100px;top:100px;" onclick="FadeOrShow('aa',0,10);" />
<script language="javascript">
function FadeOrShow(id,start,step){
var obj=document.getElementById(id);
if(start<0||start>100){
  return;
}
if(document.all){
  obj.style.filter='alpha(opacity='+(start+step)+')';
}else{
  obj.style['opacity']=(start+step)/100;
}
setTimeout('FadeOrShow("'+id+'",'+start+'+'+step+','+step+')',100);
}
FadeOrShow('aa',100,-20);
</script>

js拖动层:

var dragFlag = false;
var dragXOffset = dragYOffset = 0;

</script>

文字不停变换颜色:

//使用

colorAlert(true, document.getElementById('interlacedSpan'));

php检测用户名只能英文和简体中文

function getWordCharInt($str)
{
$str1 = preg_replace("/[/s_]/",'',$str);
if (strlen($str1) != strlen($str)) return false;
$list = array('{','}','gm','客服','kefu','代练');
foreach($list as $v)
if(strpos($str,$v)!==false) return false;
$str1 = preg_replace("//w/",'',$str1);

$flag=true;

for($i=0;$i<strlen($str1);$i++)
{
  $ord = ord(substr($str,$i,1));
  if($ord<0xa0||$ord>0xff)
  {
   $flag=false;
   break;
  }
}

return $flag;
}