JS扩展方法实例分析

String.prototype.trim = function() { return this.replace(/(^\s*)|(\s*$)/g,''); }; // 合并多个空白为一个空白 String.prototype.ResetBlank = function() { var regEx = /\s+/g; return this.replace(regEx,' '); };

// 保留数字
String.prototype.GetNum = function() {
var regEx = /[^\d]/g;
return this.replace(regEx,'');
};

// 保留中文
String.prototype.GetCN = function() {
var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g;
return this.replace(regEx,'');
};

// String转化为number
String.prototype.ToInt = function() {
return isNaN(parseInt(this)) ? this.toString() : parseInt(this);
};

// 得到字节长度
String.prototype.GetLen = function() {
var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/;
if (regEx.test(this)) {
return this.length 2;
} else {
var oMatches = this.match(/[\x00-\xff]/g);
var oLength = this.length 2 - oMatches.length;
return oLength;
}
};

// 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 add By 刘景宁 2010-12-09
String.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;
};

// 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;