string对象
1.去除空格：trim
//String.prototype.trim = function () {//js1.8版本以上自带,这里强烈建议不重复构写方法,原因会超多次走这个方法
// return this.replace(/(^\s*)|(\s*$)/g, '');
//}
String.prototype.trimLeft = function () {
return this.replace(/(^\s*)/g, '');
}
String.prototype.trimRight = function () {
return this.replace(/(\s*$)/g, '');
}
String.prototype.contains = function (str) {//利用indexof
//值为位置,为-1说明不包含
if (this.indexOf(str) >= 0) return true;
else return false;
};
String.prototype.contains = function (str) {//利用正则表达式
var reg = new RegExp(str);
return reg.test(this);
};Array对象
1.是否包含某元素
JQuery已有 $.inArray(str, arr); 来判断
如果非要写扩展方法
下面是常用扩展方法集合
Array.prototype.contains = function(item){
for(i=0;i<this.length;i++){
if(this[i]==item){return true;}
}
return false;
};
下面是常用扩展方法集合
<script type="text/javascript">
//获取字符数组
String.prototype.toCharArray = function () {
return this.split("");
}
//获取N个相同的字符串
String.prototype.repeat = function (num) {
var tmpArr = [];
for (var i = 0; i < num; i++) {
temArr.push(this);
return temArr.join("");
}
}
//逆序
String.prototype.reverse = function () {
return this.split("").reverse().join("");
}
//测试是否是数字
String.prototype.isNumeric = function () {
var tmpFloat = parseFloat(this);
if (isNaN(tmpFloat))
return false;
var tmpLen = this.length - tmpFloat.toString().length;
return tmpFloat + "0".Repeat(tmpLen) == this;
}
//测试是否是整数
String.prototype.isInt = function () {
if (this == "NaN")
return false;
return this == parseInt(this).toString();
}
// 合并多个空白为一个空白
String.prototype.resetBlank = function () {
return this.replace(/s+/g, " ");
}
// 除去左边空白
String.prototype.LTrim = function () {
return this.replace(/^s+/g, "");
}
// 除去右边空白
String.prototype.RTrim = function () {
return this.replace(/s+$/g, "");
}
// 除去两边空白
String.prototype.trim = function () {
return this.replace(/(^s+)|(s+$)/g, "");
}
// 保留数字
String.prototype.getNum = function () {
return this.replace(/[^d]/g, "");
}
// 保留字母
String.prototype.getEn = function () {
return this.replace(/[^A-Za-z]/g, "");
}
// 保留中文
String.prototype.getCn = function () {
return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g, "");
}
// 得到字节长度
String.prototype.getRealLength = function () {
return this.replace(/[^x00-xff]/g, "--").length;
}
// 从左截取指定长度的字串
String.prototype.left = function (n) {
return this.slice(0, n);
}
// 从右截取指定长度的字串
String.prototype.right = function (n) {
return this.slice(this.length - n);
}
// HTML编码
String.prototype.HTMLEncode = function () {
var re = this;
var q1 = [/x26/g, /x3C/g, /x3E/g, /x20/g];
var q2 = ["&", "<", ">", " "];
for (var i = 0; i < q1.length; i++)
re = re.replace(q1[i], q2[i]);
return re;
}
// Unicode转化
String.prototype.ascW = function () {
var strText = "";
for (var i = 0; i < this.length; i++)
strText += "&#" + this.charCodeAt(i) + ";";
return strText;
}
// 获取文件全名
String.prototype.GetFileName = function () {
var regEx = /^.*\/([^\/\?]*).*$/;
return this.replace(regEx, '$1');
};
// 获取文件扩展名
String.prototype.GetExtensionName = function () {
var regEx = /^.*\/[^\/]*(\.[^\.\?]*).*$/;
return this.replace(regEx, '$1');
};
//替换所有
String.prototype.replaceAll = function (reallyDo, replaceWith, ignoreCase) {
if (!RegExp.prototype.isPrototypeOf(reallyDo)) {
return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi" : "g")), replaceWith);
} else {
return this.replace(reallyDo, replaceWith);
}
};
//格式化字符串
String.prototype.Format = function () {
if (arguments.length == 0) {
return '';
}
if (arguments.length == 1) {
return arguments[0];
}
var reg = /{(\d+)?}/g;
var args = arguments;
var result = arguments[0].replace(reg, function ($0, $1) {
return args[parseInt($1) + 1];
});
return result;
};
// 数字补零
Number.prototype.LenWithZero = function (oCount) {
var strText = this.toString();
while (strText.length < oCount) {
strText = '0' + strText;
}
return strText;
};
// Unicode还原
Number.prototype.ChrW = function () {
return String.fromCharCode(this);
};
// 数字数组由小到大排序
Array.prototype.Min2Max = function () {
var oValue;
for (var i = 0; i < this.length; i++) {
for (var j = 0; j <= i; j++) {
if (this[i] < this[j]) {
oValue = this[i];
this[i] = this[j];
this[j] = oValue;
}
}
}
return this;
};
// 数字数组由大到小排序
Array.prototype.Max2Min = function () {
var oValue;
for (var i = 0; i < this.length; i++) {
for (var j = 0; j <= i; j++) {
if (this[i] > this[j]) {
oValue = this[i];
this[i] = this[j];
this[j] = oValue;
}
}
}
return this;
};
// 获得数字数组中最大项
Array.prototype.GetMax = function () {
var oValue = 0;
for (var i = 0; i < this.length; i++) {
if (this[i] > oValue) {
oValue = this[i];
}
}
return oValue;
};
// 获得数字数组中最小项
Array.prototype.GetMin = function () {
var oValue = 0;
for (var i = 0; i < this.length; i++) {
if (this[i] < oValue) {
oValue = this[i];
}
}
return oValue;
};
Array.prototype.add = function (item) {
this.push(item);
}
Array.prototype.addRange = function (items) {
var length = items.length;
if (length != 0) {
for (var index = 0; index < length; index++) {
this.push(items[index]);
}
}
}
Array.prototype.clear = function () {
if (this.length > 0) {
this.splice(0, this.length);
}
}
Array.prototype.isEmpty = function () {
if (this.length == 0) {
return true;
}
else {
return false;
}
}
Array.prototype.clone = function () {
var clonedArray = [];
var length = this.length;
for (var index = 0; index < length; index++) {
clonedArray[index] = this[index];
}
return clonedArray;
}
Array.prototype.contains = function (item) {
var index = this.indexOf(item);
return (index >= 0);
}
Array.prototype.dequeue = function () {
return this.shift();
}
Array.prototype.indexOf = function (item) {
var length = this.length;
if (length != 0) {
for (var index = 0; index < length; index++) {
if (this[index] == item) {
return index;
}
}
}
return -1;
}
Array.prototype.insert = function (index, item) {
this.splice(index, 0, item);
}
Array.prototype.joinstr = function (str) {
var newStr = new Array(this.length);
for (var i = 0; i < this.length; i++) {
newStr[i] = this[i] + str;
}
return newStr;
}
Array.prototype.queue = function (item) {//入队
this.push(item);
}
Array.prototype.remove = function (item) {
var index = this.indexOf(item);
if (index >= 0) {
this.splice(index, 1);
}
}
Array.prototype.removeAt = function (index) {
this.splice(index, 1);
}
//给js原生Array增加each方法
Array.prototype.each = function (fn) {
return this.length ? [fn(this.slice(0, 1))].concat(this.slice(1).each(fn)) : [];
};
// 获取当前时间的中文形式
Date.prototype.GetCNDate = function () {
var oDateText = '';
oDateText += this.getFullYear().LenWithZero(4) + new Number(24180).ChrW();
oDateText += this.getMonth().LenWithZero(2) + new Number(26376).ChrW();
oDateText += this.getDate().LenWithZero(2) + new Number(26085).ChrW();
oDateText += this.getHours().LenWithZero(2) + new Number(26102).ChrW();
oDateText += this.getMinutes().LenWithZero(2) + new Number(20998).ChrW();
oDateText += this.getSeconds().LenWithZero(2) + new Number(31186).ChrW();
oDateText += new Number(32).ChrW() + new Number(32).ChrW() + new Number(26143).ChrW() + new Number(26399).ChrW() + new String('26085199682010819977222352011620845').substr(this.getDay() * 5, 5).ToInt().ChrW();
return oDateText;
};
//扩展Date格式化
Date.prototype.Format = function (format) {
var o = {
"M+": this.getMonth() + 1, //月份
"d+": this.getDate(), //日
"h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时
"H+": this.getHours(), //小时
"m+": this.getMinutes(), //分
"s+": this.getSeconds(), //秒
"q+": Math.floor((this.getMonth() + 3) / 3), //季度
"S": this.getMilliseconds() //毫秒
};
var week = {
"0": "\u65e5",
"1": "\u4e00",
"2": "\u4e8c",
"3": "\u4e09",
"4": "\u56db",
"5": "\u4e94",
"6": "\u516d"
};
if (/(y+)/.test(format)) {
format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
}
if (/(E+)/.test(format)) {
format = format.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "\u661f\u671f" : "\u5468") : "") + week[this.getDay() + ""]);
}
for (var k in o) {
if (new RegExp("(" + k + ")").test(format)) {
format = format.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
}
}
return format;
}
Date.prototype.Diff = function (interval, objDate) {
//若参数不足或 objDate 不是日期类型則回传 undefined
if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }
switch (interval) {
//计算秒差
case 's': return parseInt((objDate - this) / 1000);
//计算分差
case 'n': return parseInt((objDate - this) / 60000);
//计算時差
case 'h': return parseInt((objDate - this) / 3600000);
//计算日差
case 'd': return parseInt((objDate - this) / 86400000);
//计算周差
case 'w': return parseInt((objDate - this) / (86400000 * 7));
//计算月差
case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);
//计算年差
case 'y': return objDate.getFullYear() - this.getFullYear();
//输入有误
default: return undefined;
}
};
//检测是否为空
Object.prototype.IsNullOrEmpty = function () {
var obj = this;
var flag = false;
if (obj == null || obj == undefined || typeof (obj) == 'undefined' || obj == '') {
flag = true;
} else if (typeof (obj) == 'string') {
obj = obj.trim();
if (obj == '') {//为空
flag = true;
} else {//不为空
obj = obj.toUpperCase();
if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {
flag = true;
}
}
}
else {
flag = false;
}
return flag;
}
</script>