原生态纯JavaScript 100大技巧大收集---你值得拥有(1--50)

用户1272076

发布于 2019-03-26 15:57:13

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发布于 2019-03-26 15:57:13

文章被收录于专栏：张培跃张培跃

1、原生JavaScript实现字符串长度截取

function cutstr(str, len) {   
    var temp;   
    var icount = 0;   
    var patrn = /[^\x00-\xff]/;   
    var strre = "";   
    for (var i = 0; i < str.length; i++) {   
        if (icount < len - 1) {   
            temp = str.substr(i, 1);   
            if (patrn.exec(temp) == null) {   
                icount = icount + 1   
            } else {   
                icount = icount + 2   
            }   
            strre += temp   
        } else {   
            break   
        }   
    }   
    return strre + "..."   
}

2、原生JavaScript获取域名主机

function getHost(url) {  
    var host = "null";  
    if(typeof url == "undefined"|| null == url) {  
        url = window.location.href;  
    }  
    var regex = /^\w+\:\/\/([^\/]*).*/;  
    var match = url.match(regex);  
    if(typeof match != "undefined" && null != match) {  
        host = match[1];  
    }  
    return host;  
}

3、原生JavaScript清除空格

String.prototype.trim = function() {  
    var reExtraSpace = /^\s*(.*?)\s+$/;  
    return this.replace(reExtraSpace, "$1")  
}

4、原生JavaScript替换全部

String.prototype.replaceAll = function(s1, s2) {  
    return this.replace(new RegExp(s1, "gm"), s2)  
}

5、原生JavaScript转义html标签

function HtmlEncode(text) {  
    return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').replace(/>/g, '>')  
}

6、原生JavaScript还原html标签

function HtmlDecode(text) {  
    return text.replace(/&/g, '&').replace(/"/g, '\"').replace(/</g, '<').replace(/>/g, '>')  
}

7、原生JavaScript时间日期格式转换

Date.prototype.Format = function(formatStr) {  
    var str = formatStr;  
    var Week = ['日', '一', '二', '三', '四', '五', '六'];  
    str = str.replace(/yyyy|YYYY/, this.getFullYear());  
    str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));  
    str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));  
    str = str.replace(/M/g, (this.getMonth() + 1));  
    str = str.replace(/w|W/g, Week[this.getDay()]);  
    str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());  
    str = str.replace(/d|D/g, this.getDate());  
    str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());  
    str = str.replace(/h|H/g, this.getHours());  
    str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());  
    str = str.replace(/m/g, this.getMinutes());  
    str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());  
    str = str.replace(/s|S/g, this.getSeconds());  
    return str;
}

8、原生JavaScript判断是否为数字类型

function isDigit(value) {  
    var patrn = /^[0-9]*$/;  
    if (patrn.exec(value) == null || value == "") {  
        return false  
    } else {  
        return true  
    }  
}

9、原生JavaScript设置cookie值

function setCookie(name, value, Hours) {  
    var d = new Date();  
    var offset = 8;  
    var utc = d.getTime() + (d.getTimezoneOffset() * 60000);  
    var nd = utc + (3600000 * offset);  
    var exp = new Date(nd);  
    exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);  
    document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"  
}

10、原生JavaScript获取cookie值

function getCookie(name) {  
    var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));  
    if (arr != null) return unescape(arr[2]);  
    return null  
}

11、原生JavaScript加入收藏夹

function AddFavorite(sURL, sTitle) {  
    try {  
        window.external.addFavorite(sURL, sTitle)  
    } catch(e) {  
        try {  
            window.sidebar.addPanel(sTitle, sURL, "")  
        } catch(e) {  
            alert("加入收藏失败，请使用Ctrl+D进行添加")  
        }  
    }  
}

12、原生JavaScript设为首页

function setHomepage() {  
    if (document.all) {  
        document.body.style.behavior = 'url(#default#homepage)';  
        document.body.setHomePage('http://www.jq-school.com')  
    } else if (window.sidebar) {  
        if (window.netscape) {  
            try {  
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")  
            } catch(e) {  
                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")  
            }  
        }  
        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);  
        prefs.setCharPref('browser.startup.homepage', 'http://www.jq-school.com')  
    }  
}

13、原生JavaScript判断IE6

var ua = navigator.userAgent.toLowerCase();  
var isIE6 = ua.indexOf("msie 6") > -1;  
if (isIE6) {  
    try {  
        document.execCommand("BackgroundImageCache", false, true)  
    } catch(e) {}  
}

14、原生JavaScript加载样式文件

function LoadStyle(url) {  
    try {  
        document.createStyleSheet(url)  
    } catch(e) {  
        var cssLink = document.createElement('link');  
        cssLink.rel = 'stylesheet';  
        cssLink.type = 'text/css';  
        cssLink.href = url;  
        var head = document.getElementsByTagName('head')[0];  
        head.appendChild(cssLink)  
    }  
}

15、原生JavaScript返回脚本内容

function evalscript(s) {  
    if(s.indexOf('<script') == -1) return s;  
    var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig;  
    var arr = [];  
    while(arr = p.exec(s)) {  
        var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;  
        var arr1 = [];  
        arr1 = p1.exec(arr[0]);  
        if(arr1) {  
            appendscript(arr1[1], '', arr1[2], arr1[3]);  
        } else {  
            p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;  
            arr1 = p1.exec(arr[0]);  
            appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1);  
        }  
    }  
    return s;  
}

16、原生JavaScript清除脚本内容

function stripscript(s) {  
    return s.replace(/<script.*?>.*?<\/script>/ig, '');  
}

17、原生JavaScript动态加载脚本文件

function appendscript(src, text, reload, charset) {  
    var id = hash(src + text);  
    if(!reload && in_array(id, evalscripts)) return;  
    if(reload && $(id)) {  
        $(id).parentNode.removeChild($(id));  
    }  
    evalscripts.push(id);  
    var scriptNode = document.createElement("script");  
    scriptNode.type = "text/javascript";  
    scriptNode.id = id;  
    scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);  
    try {  
        if(src) {  
            scriptNode.src = src;  
            scriptNode.onloadDone = false;  
            scriptNode.onload = function () {  
                scriptNode.onloadDone = true;  
                JSLOADED[src] = 1;  
            };  
            scriptNode.onreadystatechange = function () {  
                if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) {  
                    scriptNode.onloadDone = true;  
                    JSLOADED[src] = 1;  
                }  
            };  
        } else if(text){  
            scriptNode.text = text;  
        }  
        document.getElementsByTagName('head')[0].appendChild(scriptNode);  
    } catch(e) {}  
}

18、原生JavaScript返回按ID检索的元素对象

function $(id) {  
    return !id ? null : document.getElementById(id);  
}

19、原生JavaScript返回浏览器版本内容

function browserVersion(types) {  
    var other = 1;  
    for(i in types) {  
        var v = types[i] ? types[i] : i;  
        if(USERAGENT.indexOf(v) != -1) {  
            var re = new RegExp(v + '(\\/|\\s)([\\d\\.]+)', 'ig');  
            var matches = re.exec(USERAGENT);  
            var ver = matches != null ? matches[2] : 0;  
            other = ver !== 0 && v != 'mozilla' ? 0 : other;  
        }else {  
            var ver = 0;  
        }  
        eval('BROWSER.' + i + '= ver');  
    }  
    BROWSER.other = other;  
}

20、原生JavaScript元素显示的通用方法

function $(id) {  
    return !id ? null : document.getElementById(id);  
}  
function display(id) {  
    var obj = $(id);  
    if(obj.style.visibility) {  
        obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible';  
    } else {  
        obj.style.display = obj.style.display == '' ? 'none' : '';  
    }  
}

21、原生JavaScript中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现

function insertAfter(newChild,refChild){   
    var parElem=refChild.parentNode;   
    if(parElem.lastChild==refChild){   
        refChild.appendChild(newChild);   
    }else{   
        parElem.insertBefore(newChild,refChild.nextSibling);   
    }   
}

22、原生JavaScript中兼容浏览器绑定元素事件

function addEventSamp(obj,evt,fn){   
    if (obj.addEventListener) {   
        obj.addEventListener(evt, fn, false);   
    }else if(obj.attachEvent){   
        obj.attachEvent('on'+evt,fn);   
    }   
}

23、原生JavaScript光标停在文字的后面，文本框获得焦点时调用

function focusLast(){   
    var e = event.srcElement;   
    var r =e.createTextRange();   
    r.moveStart('character',e.value.length);   
    r.collapse(true);   
    r.select();   
}

24、原生JavaScript检验URL链接是否有效

function getUrlState(URL){   
    var xmlhttp = new ActiveXObject("microsoft.xmlhttp");   
    xmlhttp.Open("GET",URL, false);    
    try{    
        xmlhttp.Send();   
    }catch(e){  
    }finally{   
        var result = xmlhttp.responseText;   
        if(result){   
            if(xmlhttp.Status==200){   
                return(true);   
            }else{   
                return(false);   
            }   
        }else{   
            return(false);   
        }   
    }   
}

25、原生JavaScript格式化CSS样式代码

function formatCss(s){//格式化代码  
    s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");  
    s = s.replace(/;\s*;/g, ";"); //清除连续分号  
    s = s.replace(/\,[\s\.\#\d]*{/g, "{");  
    s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");  
    s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");  
    s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");  
    return s;  
}

26、原生JavaScript压缩CSS样式代码

function yasuoCss (s) {//压缩代码  
    s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释  
    s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");  
    s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理  
    s = s.replace(/;\s*;/g, ";"); //清除连续分号  
    s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白  
    return (s == null) ? "" : s[1];  
}

27、原生JavaScript获取当前路径

var currentPageUrl = "";  
if (typeof this.href === "undefined") {  
    currentPageUrl = document.location.toString().toLowerCase();  
}  
else {  
    currentPageUrl = this.href.toString().toLowerCase();  
}

28、原生JavaScriptIP转成整型

function _ip2int(ip){  
    var num = 0;  
    ip = ip.split(".");  
    num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);  
    num = num >>> 0;  
    return num;  
}

29、原生JavaScript整型解析为IP地址

function _int2iP(num){  
    var str;  
    var tt = new Array();  
    tt[0] = (num >>> 24) >>> 0;  
    tt[1] = ((num << 8) >>> 24) >>> 0;  
    tt[2] = (num << 16) >>> 24;  
    tt[3] = (num << 24) >>> 24;  
    str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]);  
    return str;  
}

30、原生JavaScript实现checkbox全选与全不选

function checkAll() {  
    var selectall = document.getElementById("selectall");  
    var allbox = document.getElementsByName("allbox");  
    if (selectall.checked) {  
        for (var i = 0; i < allbox.length; i++) {  
            allbox[i].checked = true;  
        }  
    } else {  
        for (var i = 0; i < allbox.length; i++) {  
            allbox[i].checked = false;  
        }  
    }  
}

(31~40)移动篇 31、原生JavaScript判断是否移动设备

function isMobile(){  
    if (typeof this._isMobile === 'boolean'){  
        return this._isMobile;  
    }  
    var screenWidth = this.getScreenWidth();  
    var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;  
    var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");  
    if(!fixViewPortsExperiment){  
        if(!this.isAppleMobileDevice()){  
            screenWidth = screenWidth/window.devicePixelRatio;  
        }  
    }  
    var isMobileScreenSize = screenWidth < 600;  
    var isMobileUserAgent = false;  
    this._isMobile = isMobileScreenSize && this.isTouchScreen();  
    return this._isMobile;  
}

32、原生JavaScript判断是否移动设备访问

function isMobileUserAgent(){  
    return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));  
}

33、原生JavaScript判断是否苹果移动设备访问

function isAppleMobileDevice(){  
    return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase()));  
}

34、原生JavaScript判断是否安卓移动设备访问

function isAndroidMobileDevice(){  
    return (/android/i.test(navigator.userAgent.toLowerCase()));  
}

35、原生JavaScript判断是否Touch屏幕

function isTouchScreen(){  
    return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);  
}

36、原生JavaScript判断是否在安卓上的谷歌浏览器

function isNewChromeOnAndroid(){  
    if(this.isAndroidMobileDevice()){  
        var userAgent = navigator.userAgent.toLowerCase();  
        if((/chrome/i.test(userAgent))){  
            var parts = userAgent.split('chrome/');  
            var fullVersionString = parts[1].split(" ")[0];  
            var versionString = fullVersionString.split('.')[0];  
            var version = parseInt(versionString);  
            if(version >= 27){  
                return true;  
            }  
        }  
    }  
    return false;  
}

37、原生JavaScript判断是否打开视窗

function isViewportOpen() {  
    return !!document.getElementById('wixMobileViewport');  
}

38、原生JavaScript获取移动设备初始化大小

function getInitZoom(){  
    if(!this._initZoom){  
        var screenWidth = Math.min(screen.height, screen.width);  
        if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){  
            screenWidth = screenWidth/window.devicePixelRatio;  
        }  
        this._initZoom = screenWidth /document.body.offsetWidth;  
    }  
    return this._initZoom;  
}

39、原生JavaScript获取移动设备最大化大小

function getZoom(){  
    var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width);  
    if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){  
        screenWidth = screenWidth/window.devicePixelRatio;  
    }  
    var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;  
    var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");  
    if(FixViewPortsExperimentRunning){  
        return screenWidth / window.innerWidth;  
    }else{  
        return screenWidth / document.body.offsetWidth;  
    }  
}

40、原生JavaScript获取移动设备屏幕宽度

function getScreenWidth(){  
    var smallerSide = Math.min(screen.width, screen.height);  
    var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;  
    var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");  
    if(fixViewPortsExperiment){  
        if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){  
            smallerSide = smallerSide/window.devicePixelRatio;  
        }  
    }  
    return smallerSide;  
}

41、原生JavaScript完美判断是否为网址

function IsURL(strUrl) {  
    var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i  
    if (regular.test(strUrl)) {  
        return true;  
    }  
    else {  
        return false;  
    }  
}

42、原生JavaScript根据样式名称检索元素对象

function getElementsByClassName(name) {  
    var tags = document.getElementsByTagName('*') || document.all;  
    var els = [];  
    for (var i = 0; i < tags.length; i++) {  
        if (tags[i].className) {  
            var cs = tags[i].className.split(' ');  
            for (var j = 0; j < cs.length; j++) {  
                if (name == cs[j]) {  
                    els.push(tags[i]);  
                    break  
                }  
            }  
        }  
    }  
    return els  
}

43、原生JavaScript判断是否以某个字符串开头

String.prototype.startWith = function (s) {  
    return this.indexOf(s) == 0  
}

44、原生JavaScript判断是否以某个字符串结束

String.prototype.endWith = function (s) {  
    var d = this.length - s.length;  
    return (d >= 0 && this.lastIndexOf(s) == d)  
}

45、原生JavaScript返回IE浏览器的版本号

function getIE(){  
    if (window.ActiveXObject){  
        var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1];  
        return parseFloat(v.substring(0, v.indexOf(".")))  
    }  
    return false  
}

46、原生JavaScript获取页面高度

function getPageHeight(){  
    var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"  
            ? a  
            : g.documentElement;  
    return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);  
}

47、原生JavaScript获取页面scrollLeft

function getPageScrollLeft(){  
    var a = document;  
    return a.documentElement.scrollLeft || a.body.scrollLeft;  
}

48、原生JavaScript获取页面可视宽度

function getPageViewWidth(){  
    var d = document, a = d.compatMode == "BackCompat"  
            ? d.body  
            : d.documentElement;  
    return a.clientWidth;  
}

49、原生JavaScript获取页面宽度

function getPageWidth(){  
    var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"  
            ? a  
            : g.documentElement;  
    return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);  
}

50、原生JavaScript获取页面scrollTop

function getPageScrollTop(){  
    var a = document;  
    return a.documentElement.scrollTop || a.body.scrollTop;  
}

文章出处：http://blog.csdn.net/chinahuyong/article/details/17708127

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