实用javascript收集

最新推荐文章于 2025-06-19 19:48:29 发布

原创最新推荐文章于 2025-06-19 19:48:29 发布 · 701 阅读

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本文提供了一系列JavaScript实用工具函数，包括事件绑定、DOM操作、Cookies管理等，旨在帮助开发者提高编码效率，简化常见任务。

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function addEvent(elm, evType, fn, useCapture) {
	if (elm.addEventListener) {
		elm.addEventListener(evType, fn, useCapture);
		return true;
	} else if (elm.attachEvent) {
		var r = elm.attachEvent('on' + evType, fn);
		return r;
	} else {
		elm['on' + evType] = fn;
	}
}

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

function getElementsByClass(searchClass, node, tag) {
	var classElements = new Array();
	if (node == null)
		node = document;
	if (tag == null)
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\\\s)' + searchClass + '(\\\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if (pattern.test(els[i].className)) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function getCookie(name) {
	var start = document.cookie.indexOf(name + "=");
	var len = start + name.length + 1;
	if ((!start) && (name != document.cookie.substring(0, name.length))) {
		return null;
	}
	if (start == -1)
		return null;
	var end = document.cookie.indexOf(';', len);
	if (end == -1)
		end = document.cookie.length;
	return unescape(document.cookie.substring(len, end));
}

function setCookie(name, value, expires, path, domain, secure) {
	var today = new Date();
	today.setTime(today.getTime());
	if (expires) {
		expires = expires * 1000 * 60 * 60 * 24;
	}
	var expires_date = new Date(today.getTime() + (expires));
	document.cookie = name + '=' + escape(value) + ((expires) ? ';expires=' + expires_date.toGMTString() : '') + // expires.toGMTString()
			((path) ? ';path=' + path : '') + ((domain) ? ';domain=' + domain : '') + ((secure) ? ';secure' : '');
}

function deleteCookie(name, path, domain) {
	if (getCookie(name))
		document.cookie = name + '=' + ((path) ? ';path=' + path : '') + ((domain) ? ';domain=' + domain : '')
				+ ';expires=Thu, 01-Jan-1970 00:00:01 GMT';
}

function $() {
	var elements = new Array();
	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getElementById(element);
		if (arguments.length == 1)
			return element;
		elements.push(element);
	}
	return elements;
}

function createXMLHttpRequest() {
	var request = false;
	if (window.XMLHttpRequest) {
		request = new XMLHttpRequest();
		if (request.overrideMimeType) {
			request.overrideMimeType('text/xml');
		}
	} else if (window.ActiveXObject) {
		var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0',
				'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0',
				'MSXML2.XMLHTTP'];
		for (var i = 0; i < versions.length; i++) {
			try {
				request = new ActiveXObject(versions[i]);
				if (request) {
					return request;
				}
			} catch (e) {
				// alert(e.message);
			}
		}
	}
	return request;
}

function findParent(field,tagName){
	if(field.nodeType==1 && field.tagName == tagName.toUpperCase())
		return field;
	var parent = field.parentNode;
	while(parent){
		if(parent.nodeType==1 && parent.tagName == tagName.toUpperCase())
			return parent;
		parent = parent.parentNode
	}
}

function getEvent() {
	if (document.all)
		return window.event;// 如果是ie
	func = getEvent.caller;
	while (func != null) {
		var arg0 = func.arguments[0];
		if (arg0) {
			if ((arg0.constructor == Event || arg0.constructor == MouseEvent)
					|| (typeof(arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
				return arg0;
			}
		}
		func = func.caller;
	}
	return null;
}

function insertAfter(parent, node, referenceNode) {
	parent.insertBefore(node, referenceNode.nextSibling);
}