客户端脚本验证码总结(涵盖大部分表单验证可以考虑加入精华)

     function Jtrim(str)    //去空隔函数
{
        var i = 0;
        var len = str.length;
        if ( str == "" ) return( str );
        j = len -1;
        flagbegin = true;
        flagend = true;
        while ( flagbegin == true && i< len)
        {
        if ( str.charAt(i) == " " )
           {
          i=i+1;
          flagbegin=true;
           }
           else
           {
              flagbegin=false;
           }
        }
        while    (flagend== true && j>=0)
        {
       if (str.charAt(j)==" ")
           {
              j=j-1;
              flagend=true;
           }