常用js函数Common.js
/*------------------------------------------------------------
Trim()去左右空格
------------------------------------------------------------*/
String.prototype.Trim = function() {
return this.replace(/(^\s*)|(\s*$)/g, "");
}
String.prototype.LTrim = function() {
return this.replace(/(^\s*)/g, "");
}
String.prototype.Rtrim = function() {
return this.replace(/(\s*$)/g, "");
}
/*------------------------------------------------------------
截取字符串，中文2个字符，英文1个字符
------------------------------------------------------------*/
function subString(str, len, hasDot) {
var newLength = 0;
var newStr = "";
var chineseRegex = /[^\x00-\xff]/g;
var singleChar = "";
var strLength = str.replace(chineseRegex, "**").length;
for (var i = 0; i < strLength; i++) {
singleChar = str.charAt(i).toString();
if (singleChar.match(chineseRegex) != null) {
newLength += 2;
}
else {
newLength++;
}
if (newLength > len) {
break;
}
newStr += singleChar;
}
if (hasDot && strLength > len) {
newStr += "...";
}
return newStr;
}
/*------------------------------------------------------------
replaceAll全部替换
------------------------------------------------------------*/
String.prototype.replaceAll = function(s1, s2) {
return this.replace(new RegExp(s1, "gm"), s2);
}
/*------------------------------------------------------------
不区分大小写的 javascript indexOf
兼容原来的 indexOf
------------------------------------------------------------*/
String.prototype._indexOf = String.prototype.indexOf;
String.prototype.indexOf = function() {
if (typeof (arguments[arguments.length - 1]) != 'boolean')
return this._indexOf.apply(this, arguments);
else {
var bi = arguments[arguments.length - 1];
var thisObj = this;
var idx = 0;
if (typeof (arguments[arguments.length - 2]) == 'number') {
idx = arguments[arguments.length - 2];
thisObj = this.substr(idx);
}
var re = new RegExp(arguments[0], bi ? 'i' : '');
var r = thisObj.match(re);
return r == null ? -1 : r.index + idx;
}
}
/*------------------------------------------------------------
过滤HTML标记
------------------------------------------------------------*/
function fliterHTML(sTest) {
var reTag = /<(?:.|\s)*?>/g;
var a = sTest.replace(reTag, "");
return a;
}
/*------------------------------------------------------------
兼容FF的previousSibling
------------------------------------------------------------*/
function previousElementSibling(lipre) {
try {
do {
lipre = lipre.previousSibling;
if (!lipre) return null;
} while (lipre.nodeType != 1)//nodeType = 3是文本节点 nodeType = 1是html节点
return lipre;
}
catch (ex) { return null; }
}
/*------------------------------------------------------------
兼容FF的nextSibling
------------------------------------------------------------*/
function nextElementSlibing(linext) {
try {
do {
linext = linext.nextSibling;
if (!linext) return null;
} while (linext.nodeType != 1)//nodeType = 3是文本节点 nodeType = 1是html节点
return linext;
}
catch (ex) { return null; }
}
/*------------------------------------------------------------
获取当前浏览器
------------------------------------------------------------*/
function myBrowser() {
var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
var isOpera = userAgent.indexOf("Opera") > -1;
if (isOpera) { return "Opera" }; //判断是否Opera浏览器
if (userAgent.indexOf("Firefox") > -1) { return "FF"; } //判断是否Firefox浏览器
if (userAgent.indexOf("Safari") > -1) { return "Safari"; } //判断是否Safari浏览器
if (userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera) { return "IE"; }; //判断是否IE浏览器
}
/*------------------------------------------------------------
兼容firefox的 outerHTML 使用以下代码后，firefox可以使用element.outerHTML
------------------------------------------------------------*/
if (myBrowser()=="FF") {
HTMLElement.prototype.__defineSetter__("outerHTML", function(sHTML) {
var r = this.ownerDocument.createRange();
r.setStartBefore(this);
var df = r.createContextualFragment(sHTML);
this.parentNode.replaceChild(df, this);
return sHTML;
});
HTMLElement.prototype.__defineGetter__("outerHTML", function() {
var attr;
var attrs = this.attributes;
var str = "<" + this.tagName.toLowerCase();
for (var i = 0; i < attrs.length; i++) {
attr = attrs[i];
if (attr.specified)
str += " " + attr.name + '="' + attr.value + '"';
}
if (!this.canHaveChildren)
return str + ">";
return str + ">" + this.innerHTML + "</" + this.tagName.toLowerCase() + ">";
});
HTMLElement.prototype.__defineGetter__("canHaveChildren", function() {
switch (this.tagName.toLowerCase()) {
case "area":
case "base":
case "basefont":
case "col":
case "frame":
case "hr":
case "img":
case "br":
case "input":
case "isindex":
case "link":
case "meta":
case "param":
return false;
}
return true;
});
}