Js 小数验证函数代码(基于正则)

function OnKeyPressValidate(obj, event, len) { 
var e = window.event || event; 
var key = e.keyCode ? e.keyCode : e.which; 
var selectedText = ""; 
if (window.getSelection) { 
var st = obj.selectionStart; 
var ed = obj.selectionEnd; 
selectedText = obj.value.substring(st, ed); 
} else if (document.selection) { 
selectedText = document.selection.createRange().text; 
} 
if (selectedText != null && selectedText != "") { 
return true; 
} 
var dot = obj.value.indexOf("."); 
len = (typeof (len) == "undefined") ? 2 : len; 
if (window.event) { 
} 
else { 
if (key == 8 || key == 9 || key == 46 || (key >= 37 && key <= 40))//for Firefox 
return true; 
} 
if (key <= 57 && key >= 48) { 
if (dot == -1) 
return true; 
else if (obj.value.length <= dot + len) 
return true; 
} else if ((key == 46) && dot == -1) { 
return true; 
} 
return false; 
} 
 
（2）onblur 事件验证 用来验证最终的数据 
 代码如下:

function OnBlurValidate(obj, messageId) { 
var tempValue = trim(obj.value); 
var message = document.getElementById(messageId); 
if (tempValue == "") { 
MessageShow("", message, false); 
return true; 
} 
else { 
var regu = /^(\d+)(\.?)(\d{0,2})$/; 
var re = new RegExp(regu); 
if (!re.test(tempValue)) { 
MessageShow("Number must be in this format (###.##) or (###)", message, true); 
return false; 
} 
else { 
MessageShow("", message, false); 
return true; 
} 
} 
}