/**
 * 判断是不是enter键
 * 
 * @return
 */
function isEnter() {
	if (window.event.keyCode == 13) {//event.keyCode
		return true;
	} else {
		return false;
	}
}

/**
 *得到当前号加一字符串
 */
function getCurNumAddOne(curnum){
	alert("hello invoice"+curnum);
	var result;
	var str=new String(curnum);//javascript 中的String
	var intStr=str*1;
	intStr++;
	var result=new String(intStr);
	while(result.length<str.length){
		result="0"+result;
	}
	intStr='';
	return result;
}

	/**
	 *四舍五入
	 */
	function number(){
		var a=3.13159265358279643383279
		alert(a.toFixed(4));
	}