This article provides an example of how to implement the JS extension method. Share with you for your reference. The specific analysis is as follows:
The JS extension method is very similar to the C# extension method, and can be chain-called by writing an extension to a class. This is very handy, and it would be interesting to write js later if you were to refer to a prewritten method in an js.
Here is an example:
<head>
<title> test JS Extension methods </title>
<script type="text/javascript">
// Merge multiple whitespace as 1 A blank
String.prototype.ResetBlank = function() { // Extending a string
var regEx = /\s+/g;
return this.replace(regEx, ' ');
};
window.onload = function()
{
var str = " you Is he ok after he thinks ?";
alert(str);
str = str.ResetBlank(); // So I'm going to be able to call alpha and beta C# Very like !
alert(str);
}
</script>
</head>It’s like telling yourself you have one of these things;
Here’s a great js extension to find:
// Clear the Spaces on both sides
String.prototype.trim = function() {
return this.replace(/(^\s*)|(\s*$)/g, '');
};
// Merge multiple whitespace as 1 A blank
String.prototype.ResetBlank = function() {
var regEx = /\s+/g;
return this.replace(regEx, ' ');
};
// Keep digital
String.prototype.GetNum = function() {
var regEx = /[^\d]/g;
return this.replace(regEx, '');
};
// Keep Chinese
String.prototype.GetCN = function() {
var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g;
return this.replace(regEx, '');
};
// String into Number
String.prototype.ToInt = function() {
return isNaN(parseInt(this)) ? this.toString() : parseInt(this);
};
// You get the length of bytes
String.prototype.GetLen = function() {
var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/;
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;
}
};
// Get the full name of the file
String.prototype.GetFileName = function() {
var regEx = /^.*\/([^\/\?]*).*$/;
return this.replace(regEx, '$1');
};
// Gets the file extension
String.prototype.GetExtensionName = function() {
var regEx = /^.*\/[^\/]*(\.[^\.\?]*).*$/;
return this.replace(regEx, '$1');
};
// Replace all
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);
}
};
// Formatted string add By Jing-ning liu 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;
};
// Digital zero padding
Number.prototype.LenWithZero = function(oCount) {
var strText = this.toString();
while (strText.length < oCount) {
strText = '0' + strText;
}
return strText;
};
// Unicode reduction
Number.prototype.ChrW = function() {
return String.fromCharCode(this);
};
// Arrays of Numbers are sorted from small to large
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;
};
// Arrays of Numbers are sorted from large to small
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;
};
// Gets the largest item in an array of Numbers
Array.prototype.GetMax = function() {
var oValue = 0;
for (var i = 0; i < this.length; i++) {
if (this[i] > oValue) {
oValue = this[i];
}
}
return oValue;
};
// Gets the smallest item in an array of Numbers
Array.prototype.GetMin = function() {
var oValue = 0;
for (var i = 0; i < this.length; i++) {
if (this[i] < oValue) {
oValue = this[i];
}
}
return oValue;
};
// Gets the Chinese version of the current time
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;
};
// extension Date formatting
Date.prototype.Format = function(format) {
var o = {
"M+": this.getMonth() + 1, // in
"d+": this.getDate(), // day
"h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, // hours
"H+": this.getHours(), // hours
"m+": this.getMinutes(), // points
"s+": this.getSeconds(), // seconds
"q+": Math.floor((this.getMonth() + 3) / 3), // quarter
"S": this.getMilliseconds() // ms
};
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) {
// If the parameter is insufficient or objDate Not a date type undefined
if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }
switch (interval) {
// Estimated seconds,
case 's': return parseInt((objDate - this) / 1000);
// Calculate the gap
case 'n': return parseInt((objDate - this) / 60000);
// Poor computing �
case 'h': return parseInt((objDate - this) / 3600000);
// Poor calculation,
case 'd': return parseInt((objDate - this) / 86400000);
// Estimated weeks,
case 'w': return parseInt((objDate - this) / (86400000 * 7));
// Calculate month less
case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);
// Calculation in poor
case 'y': return objDate.getFullYear() - this.getFullYear();
// Input is wrong
default: return undefined;
}
};
// Check if it is empty
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 == '') {// Is empty
flag = true;
} else {// Don't empty
obj = obj.toUpperCase();
if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {
flag = true;
}
}
}
else {
flag = false;
}
return flag;I hope this article is helpful for you to design javascript program.