自定义Flash ActionScript中的trim函数，去回车函数，字符串替换函数，字节换算函数

去掉字符串的前后空格

function trim(returnString) {
 for (; returnString.charCodeAt(0) == 0x20; returnString=returnString.substr(1)) {
 }
 for (; returnString.charCodeAt(returnString.length-1) == 0x20; returnString=returnString.substr(0, returnString.length-1)) {
 }
 return returnString;
}

去掉字符串的前后回车

function trimEnter(returnString) {
 for (; returnString.substr(0, 1) == String.fromCharCode(13); returnString=returnString.substr(1)) {
 }
 for (; returnString.substr(returnString.length-1, 1) == String.fromCharCode(13); returnString=returnString.substr(0, returnString.length-1)) {
 }
 return returnString;
}

字符替换函数 把s中o替换成n

function replace(s:String, o:String, n:String) {
 return s=s.split(o).join(n);
}

字节换算KB,MB

function GetSizeType(size:Number) {
 if (size<1024) {
  return int(size*100)/100+" bytes";
 }
 if (size<1048576) {
  return int((size/1024)*100)/100+"KB";
 }
 if (size<1073741824) {
  return int((size/1048576)*100)/100+"MB";
 }
 return int((size/1073741824)*100)/100+"GB";
}

验证输入的内容是否为数字

function checkNumber(o) {
 if (isNaN(o) == true) {
  trace("输入了非数字");
 } else {
  trace("输入了数字");
 }
}