JavaScript常用方法汇总
/* 判断浏览器 */
function getOs() {
if (navigator.userAgent.indexOf("MSIE 8.0") > 0) {
return "MSIE8";
}
else if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {
return "MSIE6";
}
else if (navigator.userAgent.indexOf("MSIE 7.0") > 0) {
return "MSIE7";
}
else if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) {
return "Firefox";
}
if (navigator.userAgent.indexOf("Chrome") > 0) {
return "Chrome";
}
else {
return "Other";
}
}
/* JS判断两个日期大小 适合 2012-09-09 与2012-9-9 两种格式的对比 */
//得到日期值并转化成日期格式，replace(/\-/g, "\/")是根据验证表达式把日期转化成长日期格式，这样再进行判断就好判断了
function ValidateDate() {
var beginDate = $("#t_datestart").val();
var endDate = $("#t_dateend").val();
if (beginDate.length > 0 && endDate.length>0) {
var sDate = new Date(beginDate.replace(/\-/g, "\/"));
var eDate= new Date(endDate.replace(/\-/g, "\/"));
if (sDate > eDate) {
alert('开始日期要小于结束日期');
return false;
}
}
}
/* 移除事件 */
this.moveBind = function (objId, eventType, callBack) {
var obj = document.getElementById(objId);
if (obj.removeEventListener) {
obj.removeEventListener(eventType, callBack, false);
}
else if (window.detachEvent) {
obj.detachEvent('on' + eventType, callBack);
}
else {
obj['on' + eventType] = null;
}
}
/* 回车提交 */
$("id").onkeypress = function (event) {
event = (event) ? event : ((window.event) ? window.event : "")
keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);
if (keyCode == 13) {
$("SubmitLogin").onclick();
}
}
/* JS 执行计时器 */
timeStart = new Date().getTime();
timesEnd = new Date().getTime();
document.getElementById("time").innerHTML = timesEnd - timeStart;
/* JS 写Cookie */
function setCookie(name, value, expires, path, domain) {
if (!expires) expires = -1;
if (!path) path = "/";
var d = "" + name + "=" + value;
var e;
if (expires < 0) {
e = "";
}
else if (expires == 0) {
var f = new Date(1970, 1, 1);
e = ";expires=" + f.toUTCString();
}
else {
var now = new Date();
var f = new Date(now.getTime() + expires * 1000);
e = ";expires=" + f.toUTCString();
}
var dm;
if (!domain) {
dm = "";
}
else {
dm = ";domain=" + domain;
}
document.cookie = name + "=" + value + ";path=" + path + e + dm;
};
/* JS 读Cookie */
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') c = c.substring(1, c.length);
if (c.indexOf(nameEQ) == 0) {
return decodeURIComponent(c.substring(nameEQ.length, c.length))
}
} return null
}
/* Ajax 请求 */
C.ajax = function (args) {
var self = this;
this.options = {
type: 'GET',
async: true,
contentType: 'application/x-www-form-urlencoded',
url: 'about:blank',
data: null,
success: {},
error: {}
};
this.getXmlHttp = function () {
var xmlHttp;
try {
xmlhttp = new XMLHttpRequest();
}
catch (e) {
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
if (!xmlhttp) {
alert('您的浏览器不支持AJAX');
return false;
}
return xmlhttp;
};
this.send = function () {
C.each(self.options, function (key, val) {
self.options[key] = (args[key] == null) ? val : args[key];
});
var xmlHttp = new self.getXmlHttp();
if (self.options.type.toUpperCase() == 'GET') {
xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.test(self.options.url) ? '&' : '?') + self.options.data)), self.options.async);
}
else {
xmlHttp.open(self.options.type, self.options.url, self.options.async);
xmlHttp.setRequestHeader('Content-Length', self.options.data.length);
}
xmlHttp.setRequestHeader('Content-Type', self.options.contentType);
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200 || xmlHttp.status == 0) {
if (typeof self.options.success == 'function') self.options.success(xmlHttp.responseText);
xmlHttp = null;
}
else {
if (typeof self.options.error == 'function') self.options.error('Server Status: ' + xmlHttp.status);
}
}
};
xmlHttp.send(self.options.type.toUpperCase() == 'POST' ? self.options.data.toString() : null);
};
this.send();
};
/* JS StringBuilder 用法 */
function StringBuilder() {
this.strings = new Array;
};
StringBuilder.prototype.append = function (str) {
this.strings.push(str);
};
StringBuilder.prototype.toString = function () {
return this.strings.join('');
};
/* JS 加载到顶部LoadJS */
function loadJS (url, fn) {
var ss = document.getElementsByName('script'),
loaded = false;
for (var i = 0, len = ss.length; i < len; i++) {
if (ss[i].src && ss[i].getAttribute('src') == url) {
loaded = true;
break;
}
}
if (loaded) {
if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();
return false;
}
var s = document.createElement('script'),
b = false;
s.setAttribute('type', 'text/javascript');
s.setAttribute('src', url);
s.onload = s.onreadystatechange = function () {
if (!b && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')) {
b = true;
if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();
}
};
document.getElementsByTagName('head')[0].appendChild(s);
},
bind: function (objId, eventType, callBack) { //适用于任何浏览器的绑定
var obj = document.getElementById(objId);
if (obj.addEventListener) {
obj.addEventListener(eventType, callBack, false);
}
else if (window.attachEvent) {
obj.attachEvent('on' + eventType, callBack);
}
else {
obj['on' + eventType] = callBack;
}
}
function JSLoad (args) {
s = document.createElement("script");
s.setAttribute("type", "text/javascript");
s.setAttribute("src", args.url);
s.onload = s.onreadystatechange = function () {
if (!s.readyState || s.readyState == "loaded" || s.readyState == "complete") {
if (typeof args.callback == "function") args.callback(this, args);
s.onload = s.onreadystatechange = null;
try {
s.parentNode && s.parentNode.removeChild(s);
} catch (e) { }
}
};
document.getElementsByTagName("head")[0].appendChild(s);
}
/* 清空 LoadJS 加载到顶部的js引用 */
function ClearHeadJs (src) {
var js = document.getElementsByTagName('head')[0].children;
var obj = null;
for (var i = 0; i < js.length; i++) {
if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {
obj = js[i];
}
}
document.getElementsByTagName('head')[0].removeChild(obj);
};