common.js

这是《Struts网络编程实例》一书zhogn 的源代码部分

//???????
function validate(text){

  var pattern = /^[1-9][0-9]*$/;
  if(text.value.match(pattern)){
     return true;
  }else{
  	return false;
  }
}
//???????????
function trim(inputString) {
     if (typeof inputString != "string") { return inputString; }
   var retValue = inputString;
   var ch = retValue.substring(0, 1);
   while (ch == " ") {
      retValue = retValue.substring(1, retValue.length);
      ch = retValue.substring(0, 1);
   }
   ch = retValue.substring(retValue.length-1, retValue.length);
   while (ch == " ") {
      retValue = retValue.substring(0, retValue.length-1);
      ch = retValue.substring(retValue.length-1, retValue.length);
   }
 
   return retValue; 
} 
//????????
function getLength(s)
{
	var sLength = 0;
	for (i = 0; i < s.length; i++)
	{ 
		var c = s.charAt(i);
		if (c.charCodeAt(0) < 256)
			sLength += 1;
		else
			sLength += 2
	}
	return sLength;
}