js 钱大小写转换,和 数值格式化

var num=56.45678;
var rs1=num.toExponential(2);//rs1的值为5.65e+1
var rs2=num.toFixed(2);//rs的值为56.45
var rs3=num.toPrecision(2);//rs的值为56

function regInput(reg)
{
	var srcElem = event.srcElement
	var oSel = document.selection.createRange()
	oSel = oSel.duplicate()
	 
	oSel.text = ""
	var srcRange = srcElem.createTextRange()
	oSel.setEndPoint("StartToStart", srcRange)
	var num = oSel.text + String.fromCharCode(event.keyCode) + srcRange.text.substr(oSel.text.length)
	event.returnvalue = reg.test(num)
}

//转小写
function aNumber(num)
{
	var numArray = new Array()
	var unit = "亿万元$"
	for (var i=0; i<unit.length; i++)
	{
			var re = eval_r("/"+ (numArray[i-1] ? unit.charAt(i-1) : "") +"(.*)"+unit.charAt(i)+"/")
		if (num.match(re))
		{
			numArray[i] = num.match(re)[1].replace(/^拾/, "壹拾")
			numArray[i] = numArray[i].replace(/[零壹贰叁肆伍陆柒捌玖]/g, function ($1)
			{
				return "零壹贰叁肆伍陆柒捌玖".indexOf($1)
			})
			numArray[i] = numArray[i].replace(/[分角拾百千]/g, function ($1)
			{
				return "*"+Math.pow(10, "分角 拾百千 ".indexOf($1)-2)+"+"
			}).replace(/^\*|\+$/g, "").replace(/整/, "0")
			numArray[i] = "(" + numArray[i] + ")*"+Math.ceil(Math.pow(10, (2-i)*4))
		}
		else numArray[i] = 0
	}
	return eval_r(numArray.join("+"))
}

//转大写
function chineseNumber(num)
{
	if (isNaN(num) || num > Math.pow(10, 12)) return ""
	var cn = "零壹贰叁肆伍陆柒捌玖"
	var unit = new Array("拾百千", "分角")
	var unit1= new Array("万亿", "")
	var numArray = num.toString().split(".")
	var start = new Array(numArray[0].length-1, 2)
	function toChinese(num, index)
	{
		var num = num.replace(/\d/g, function ($1)
		{
			return cn.charAt($1)+unit[index].charAt(start--%4 ? start%4 : -1)
		})
		return num
	}
	for (var i=0; i<numArray.length; i++)
	{
		var tmp = ""
		for (var j=0; j*4<numArray[i].length; j++)
		{
		var strIndex = numArray[i].length-(j+1)*4
		var str = numArray[i].substring(strIndex, strIndex+4)
		var start = i ? 2 : str.length-1
		var tmp1 = toChinese(str, i)
		tmp1 = tmp1.replace(/(零.)+/g, "零").replace(/零+$/, "")
		tmp1 = tmp1.replace(/^壹拾/, "拾")
		tmp = (tmp1+unit1[i].charAt(j-1)) + tmp
		}
		numArray[i] = tmp
	}
	numArray[1] = numArray[1] ? numArray[1] : ""
	numArray[0] = numArray[0] ? numArray[0]+"元" : numArray[0], numArray[1] = numArray[1].replace(/^零+/, "")
	numArray[1] = numArray[1].match(/分/) ? numArray[1] : numArray[1]+"整"
	return numArray[0]+numArray[1]
}