(一)100个直接可以拿来用的JavaScript实用功能代码片段(一)
1 function cutstr(str, len) { 2 var temp; 3 var icount = 0; 4 var patrn = /[^\x00-\xff]/; 5 var strre = ""; 6 for (var i = 0; i < str.length; i++) { 7 if (icount < len - 1) { 8 temp = str.substr(i, 1); 9 if (patrn.exec(temp) == null) {10 icount = icount + 111 } else {12 icount = icount + 213 }14 strre += temp15 } else {16 break17 }18 }19 return strre + "..."20 }?
2、原生JavaScript获取域名主机
1 function getHost(url) { 2 var host = "null"; 3 if(typeof url == "undefined"|| null == url) { 4 url = window.location.href; 5 } 6 var regex = /^\w+\:\/\/([^\/]*).*/; 7 var match = url.match(regex); 8 if(typeof match != "undefined" && null != match) { 9 host = match[1];10 }11 return host;12 }?
3、原生JavaScript清除空格
1 Date.prototype.Format = function(formatStr) { 2 var str = formatStr; 3 var Week = ['日', '一', '二', '三', '四', '五', '六']; 4 str = str.replace(/yyyy|YYYY/, this.getFullYear()); 5 str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100)); 6 str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1)); 7 str = str.replace(/M/g, (this.getMonth() + 1)); 8 str = str.replace(/w|W/g, Week[this.getDay()]); 9 str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());10 str = str.replace(/d|D/g, this.getDate());11 str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());12 str = str.replace(/h|H/g, this.getHours());13 str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());14 str = str.replace(/m/g, this.getMinutes());15 str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());16 str = str.replace(/s|S/g, this.getSeconds());17 return str18 }
8、原生JavaScript判断是否为数字类型
1 function isDigit(value) {2 var patrn = /^[0-9]*$/;3 if (patrn.exec(value) == null || value == "") {4 return false5 } else {6 return true7 }8 }
9、原生JavaScript设置cookie值
1 function setCookie(name, value, Hours) {2 var d = new Date();3 var offset = 8;4 var utc = d.getTime() + (d.getTimezoneOffset() * 60000);5 var nd = utc + (3600000 * offset);6 var exp = new Date(nd);7 exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);8 document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"9 }
10、原生JavaScript获取cookie值
11、原生JavaScript加入收藏夹
1 function AddFavorite(sURL, sTitle) { 2 try { 3 window.external.addFavorite(sURL, sTitle) 4 } catch(e) { 5 try { 6 window.sidebar.addPanel(sTitle, sURL, "") 7 } catch(e) { 8 alert("加入收藏失败，请使用Ctrl+D进行添加") 9 }10 }11 }?
12、原生JavaScript设为首页
1 function setHomepage() { 2 if (document.all) { 3 document.body.style.behavior = 'url(#default#homepage)'; 4 document.body.setHomePage('http://www.jq-school.com') 5 } else if (window.sidebar) { 6 if (window.netscape) { 7 try { 8 netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect") 9 } catch(e) {10 alert("该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true")11 }12 }13 var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);14 prefs.setCharPref('browser.startup.homepage', 'http://www.jq-school.com')15 }16 }?
13、原生JavaScript判断IE6
1 var ua = navigator.userAgent.toLowerCase();2 var isIE6 = ua.indexOf("msie 6") > -1;3 if (isIE6) {4 try {5 document.execCommand("BackgroundImageCache", false, true)6 } catch(e) {}7 }?
14、原生JavaScript加载样式文件
1 function LoadStyle(url) { 2 try { 3 document.createStyleSheet(url) 4 } catch(e) { 5 var cssLink = document.createElement('link'); 6 cssLink.rel = 'stylesheet'; 7 cssLink.type = 'text/css'; 8 cssLink.href = url; 9 var head = document.getElementsByTagName('head')[0];10 head.appendChild(cssLink)11 }12 }?
15、原生JavaScript返回脚本内容
1 function evalscript(s) { 2 if(s.indexOf('<script') == -1) return s; 3 var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig; 4 var arr = []; 5 while(arr = p.exec(s)) { 6 var p1 = /<script[^\>]*?src="([^\>]*?)"[^\>]*?(reload="1")?(?:charset="([\w\-]+?)")?><\/script>/i; 7 var arr1 = []; 8 arr1 = p1.exec(arr[0]); 9 if(arr1) {10 appendscript(arr1[1], '', arr1[2], arr1[3]);11 } else {12 p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;13 arr1 = p1.exec(arr[0]);14 appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1);15 }16 }17 return s;18 }?
16、原生JavaScript清除脚本内容
1 function appendscript(src, text, reload, charset) { 2 var id = hash(src + text); 3 if(!reload && in_array(id, evalscripts)) return; 4 if(reload && $(id)) { 5 $(id).parentNode.removeChild($(id)); 6 } 7 8 evalscripts.push(id); 9 var scriptNode = document.createElement("script");10 scriptNode.type = "text/javascript";11 scriptNode.id = id;12 scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);13 try {14 if(src) {15 scriptNode.src = src;16 scriptNode.onloadDone = false;17 scriptNode.onload = function () {18 scriptNode.onloadDone = true;19 JSLOADED[src] = 1;20 };21 scriptNode.onreadystatechange = function () {22 if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) {23 scriptNode.onloadDone = true;24 JSLOADED[src] = 1;25 }26 };27 } else if(text){28 scriptNode.text = text;29 }30 document.getElementsByTagName('head')[0].appendChild(scriptNode);31 } catch(e) {}32 }?
18、原生JavaScript返回按ID检索的元素对象
1 function browserVersion(types) { 2 var other = 1; 3 for(i in types) { 4 var v = types[i] ? types[i] : i; 5 if(USERAGENT.indexOf(v) != -1) { 6 var re = new RegExp(v + '(\\/|\\s)([\\d\\.]+)', 'ig'); 7 var matches = re.exec(USERAGENT); 8 var ver = matches != null ? matches[2] : 0; 9 other = ver !== 0 && v != 'mozilla' ? 0 : other;10 }else {11 var ver = 0;12 }13 eval('BROWSER.' + i + '= ver');14 }15 BROWSER.other = other;16 }?
20、原生JavaScript元素显示的通用方法
1 function $(id) { 2 return !id ? null : document.getElementById(id); 3 } 4 function display(id) { 5 var obj = $(id); 6 if(obj.style.visibility) { 7 obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible'; 8 } else { 9 obj.style.display = obj.style.display == '' ? 'none' : '';10 }11 }?
21、原生JavaScript中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现
1 function insertAfter(newChild,refChild){ 2 var parElem=refChild.parentNode; 3 if(parElem.lastChild==refChild){ 4 refChild.appendChild(newChild); 5 }else{ 6 parElem.insertBefore(newChild,refChild.nextSibling); 7 } 8 }?
22、原生JavaScript中兼容浏览器绑定元素事件
1 function addEventSamp(obj,evt,fn){ 2 if (obj.addEventListener) { 3 obj.addEventListener(evt, fn, false); 4 }else if(obj.attachEvent){ 5 obj.attachEvent('on'+evt,fn); 6 } 7 } ?
23、原生JavaScript光标停在文字的后面，文本框获得焦点时调用
1 function focusLast(){ 2 var e = event.srcElement; 3 var r =e.createTextRange(); 4 r.moveStart('character',e.value.length); 5 r.collapse(true); 6 r.select(); 7 }?
24、原生JavaScript检验URL链接是否有效
1 function getUrlState(URL){ 2 var xmlhttp = new ActiveXObject("microsoft.xmlhttp"); 3 xmlhttp.Open("GET",URL, false); 4 try{ 5 xmlhttp.Send(); 6 }catch(e){ 7 }finally{ 8 var result = xmlhttp.responseText; 9 if(result){ 10 if(xmlhttp.Status==200){ 11 return(true); 12 }else{ 13 return(false); 14 } 15 }else{ 16 return(false); 17 } 18 } 19 }?
25、原生JavaScript格式化CSS样式代码
1 function formatCss(s){//格式化代码2 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");3 s = s.replace(/;\s*;/g, ";"); //清除连续分号4 s = s.replace(/\,[\s\.\#\d]*{/g, "{");5 s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");6 s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");7 s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");8 return s;9 }?
26、原生JavaScript压缩CSS样式代码
1 function yasuoCss (s) {//压缩代码2 s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释3 s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");4 s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理5 s = s.replace(/;\s*;/g, ";"); //清除连续分号6 s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白7 return (s == null) ? "" : s[1];8 }?
27、原生JavaScript获取当前路径
1 var currentPageUrl = "";2 if (typeof this.href === "undefined") {3 currentPageUrl = document.location.toString().toLowerCase();4 }5 else {6 currentPageUrl = this.href.toString().toLowerCase();7 }?
28、原生JavaScriptIP转成整型
1 function _ip2int(ip){2 var num = 0;3 ip = ip.split(".");4 num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);5 num = num >>> 0;6 return num;7 }?
29、原生JavaScript整型解析为IP地址
1 function _int2iP(num){ 2 var str; 3 var tt = new Array(); 4 tt[0] = (num >>> 24) >>> 0; 5 tt[1] = ((num << 8) >>> 24) >>> 0; 6 tt[2] = (num << 16) >>> 24; 7 tt[3] = (num << 24) >>> 24; 8 str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]); 9 return str;10 }?
30、原生JavaScript实现checkbox全选与全不选
1 function checkAll() { 2 var selectall = document.getElementById("selectall"); 3 var allbox = document.getElementsByName("allbox"); 4 if (selectall.checked) { 5 for (var i = 0; i < allbox.length; i++) { 6 allbox[i].checked = true; 7 } 8 } else { 9 for (var i = 0; i < allbox.length; i++) {10 allbox[i].checked = false;11 }12 }13 }?
10 楼 guozhen_168 2013-09-13 整体感觉好不错，不过有几个东西是会和jquery冲突的，我觉得用的人，要做些适当改动。 11 楼 Y2N2C2J2 2013-09-13 貌似刚在博客园中看到过这个帖子！