javascript工具类 （判断闰年，汉字，IP，精度等。。）

去除首尾空格，检查字符串是否包含汉字，打开新窗口，验证ip，将浮点数规整为指定的精度，判断提供的字符串是否为空，判断提供的字符串是否为整数，判断输入的字符是否为大写或字母，判断输入的字符是否为0-9数字字符，判断提供的字符串只含有数字字符，判断闰年）

/************************************************************************************
名称：	existChinese(strValue)
功能：	该函数用于检查字符串是否包含汉字
参数：	strValue---入参；字符串；待处理的字符串
返回：	布尔值； true--包含汉字； false--不包含汉字
引用：	无
说明：
**************************************************************************************/
function existChinese(strValue)
{
var chrCode
for(var iChar = 0; iChar < strValue.length; iChar++)
{
chrCode = strValue.charCodeAt(iChar);
if(parseInt(chrCode) > 255)
{
return true;
}
}
return false;
}

/*********************************************************************************** 打开新窗口*/function openWindow(i_URL, i_Width, i_Height) {openWindow(i_URL, i_Width, i_Height, null, null);}function openWindow(i_URL, i_Width, i_Height, i_Feature) {openWindow(i_URL, i_Width, i_Height, null, i_Feature);}function openWindow(i_URL, i_Width, i_Height, i_WindowName, i_Feature){var v_URL = i_URL;var v_Width = i_Width;var v_Height = i_Height;var v_WindowName = i_WindowName;var v_Top;var v_Left;var v_Feature = "";if (v_WindowName == null) {v_WindowName = "myWindow";}var objWindowif (!objWindow || objWindow.closed){v_Top = screen.availHeight / 2 - v_Height / 2 - 30;v_Left = screen.availWidth / 2 - v_Width / 2;v_Feature += "top=" + v_Top + ",";v_Feature += "left=" + v_Left + ",";v_Feature += "width=" + v_Width + ",";v_Feature += "height=" + v_Height + ",";if (i_Feature == null) {v_Feature += "directories=no,fullscreen=no,resizable=no,scrollbars=yes,status=1";} else {v_Feature += i_Feature;}objWindow = window.open(v_URL, v_WindowName, v_Feature);//objWindow=window.open (v_URL,v_WindowName,"directories=no,fullscreen=no,resizable=no,scrollbars=no,status=1");//v_Top=screen.availHeight/2-v_Height/2;//v_Left=screen.availWidth/2-v_Width/2;//objWindow.moveTo(v_Left,v_Top);//objWindow.resizeTo(v_Width,v_Height);objWindow.outerWidth = screen.availWidth;objWindow.outerHeight = screen.availHeight - 25;} else {objWindow.focus();}objWindow.focus();}

/************************************************************************************名称： trim(strValue)功能： 该函数用于去除字符串前后的空格参数： strValue---入参；字符串；待处理的字符串返回： 字符串引用： 无说明： 若为全空格字符串则返回空**************************************************************************************/function trim(strValue){var iLTR, jRTL;var chr;//去除字符串前后的空格for( iLTR = 0; iLTR < strValue.length; iLTR++ ){chr = strValue.charAt(iLTR) ;if( chr != " " ) break;}if( iLTR == strValue.length ) return "";//去除字符串前后的空格for( jRTL = strValue.length - 1; jRTL >= 0; jRTL-- ){chr = strValue.charAt(jRTL);if( chr != " " ) break;}return strValue.substring(iLTR, jRTL + 1);}

/** 验证ip*/function checkIp(strIP) {if (isEmpty(strIP)) return false;var re = /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/g //匹配IP地址的正则表达式if (re.test(strIP)){if (RegExp.$1 < 256 && RegExp.$2 < 256 && RegExp.$3 < 256 && RegExp.$4 < 256) return true;}return false;}

/*** 将浮点数规整为指定的精度* @pram original_number 原始浮点数* @pram decimals 结果的小数位精度值* @return 规整后的浮点数*/function round_decimals(original_number , decimals){var result1 = original_number * Math.pow(10 , decimals);var result2 = Math.round(result1);var result3 = result2 / Math.pow(10 , decimals);return(result3);}

/*** 判断提供的字符串是否为空* @param field 输入字符串* @return true/false*/function isEmpty(field){return ((field == null) || (field.length == 0) || myTrim(field)=="");}/*** 判断提供的字符串是否为整数* @param field 输入字符串* @return true/false*/function isInteger(field){s = myTrim(field);var i;if (isEmpty(field)){return false;}for (i=0; i<field.length; i++){var c = field.charAt(i);if (!isDigit(c)){return false;}if(c==0&&i==0&&field.length>1){return false;}}return true;}/*** 判断输入的字符是否为大写或字母字符* @param c 输入字符* @return true/false*/function isLetter(c){return ( ((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")) );}/*** 判断输入的字符是否为0-9数字字符* @param c 输入字符* @return true/false*/function isDigit(c){return ((c >= "0") && (c <= "9"));}

/*** 判断提供的字符串只含有数字字符* @param field 输入字符串* @return true/false*/function isNumbers(field){field = myTrim(field);var i;for (i = 0; i < field.length; i++){var c = field.charAt(i);if (!isDigit(c) ){return false;}}return true;}

/***判断闰年* @param s 年@return true/false**/function isRunNian(s){//alert(s%4);if(s%4!=0){return false;}else{if(s%100!=0){return true;}else{if(s%400==0){return true;}else{return false;}}}}