/*** 删除首尾空格 ***/
String.prototype.Trim = function() {
  return this.replace(/(^\s*)|(\s*$)/g, "");
}

/*** 统计指定字符串出现次数 ***/
String.prototype.Occurs = function(ch) {
  var re = eval("/[^"+ch+"]/g");
  return this.replace(re, "").length;
}  

/*** 检查是否由数字组成 ***/
String.prototype.isDigit = function() {
  var s = this.Trim();
  return (s.replace(/[0-9]/g, "").length == 0);
} 

/*** 检查是否由数字字母下划线组成 ***/
String.prototype.isAlpha = function() {
  return (this.replace(/\w/g, "").length == 0);
}

/*** 检查是否为正数 ***/
String.prototype.isNumber = function() {
  var s = this.Trim();
  return (s.search(/^[+-]?[0-9.]*$/) >= 0);
}
  
/*** 返回字节数 ***/
String.prototype.lenb = function() {
  var l=this.length;
  var n=l;
  for(var i=0;i<l;i++) {
    if(this.charCodeAt(i)<0||this.charCodeAt(i)>255)
      n++;
  }
  return n;
}

/*** 检查是否包含汉字 ***/
String.prototype.isInChinese = function() {
  return (this.length != this.lenb());
}

/*** 检查EMAIL地址是否正确 ***/
String.prototype.isEmail = function() {
  var strr;
  var mail = this;
  var re = /(\w+@\w+\.\w+)(\.{0,1}\w*)(\.{0,1}\w*)/i;
  re.exec(mail);
  if(RegExp.$3!="" && RegExp.$3!="." && RegExp.$2!=".")
    strr = RegExp.$1+RegExp.$2+RegExp.$3;
  else
    if(RegExp.$2!="" && RegExp.$2!=".")
      strr = RegExp.$1+RegExp.$2;
    else
      strr = RegExp.$1;
  return (strr==mail);
}

/*** 检查日期是否正确 ***/
String.prototype.isDate = function() {
  var p;
  var re1 = /(\d{4})[?ê./-](\d{1,2})[??./-](\d{1,2})[??]?$/;
  var re2 = /(\d{1,2})[??./-](\d{1,2})[??./-](\d{2})[?ê]?$/;
  var re3 = /(\d{1,2})[??./-](\d{1,2})[??./-](\d{4})[?ê]?$/;
  if(re1.test(this)) { 
    p = re1.exec(this);
    return new Date(p[1],p[2],p[3]);
  } 
  if(re2.test(this)) {
    p = re2.exec(this);
    return new Date(p[3],p[1],p[2]);
  }
  if(re3.test(this)) {
    p = re3.exec(this);
    return new Date(p[3],p[1],p[2]);
  }
  return false;
}

/*** 检查是否为空，并弹出警告 ***/
function checkEmpty(obj, msg) {
  var val = obj.value.Trim();
  if(val == "") {
    alert("错误：" + msg);
    obj.focus();
    return false;	  	
  }	
  return true;
}

/*** 转到下一控件 ***/
function nextControl() {
  if (event.keyCode == 13) event.keyCode = 9;	
}

//弹出窗口函数
function js_callpage(htmlurl) {
  var 
newwin=window.open(htmlurl,"homeWin","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=617,height=500");
  newwin.focus();
  return false;
}