javascript:去除字符串的前后空格

方法一:
function killspace(x){
  while((x.length>0) && (x.charat(0)==' '))
    x = x.substring(1,x.length);
 //while((x.length>0) && (x.charat(x.length-1)==' '))
 while(x.length>0)
    x = x.substring(0,x.length-1);
 alert("kill=" + x + "==")
  return x;
} 
实例: var a = killspace(“  abc  “); //得出a == “abc“

方法二:
string.prototype.trim = function()
{
   return this.replace(/(^\s+)|\s+$/g,"");
 }
实例: var a = “ abc  “.trim();   //得出a == “abc“