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  • JavaScript学习总结（9）——JS常用函数（一）

    本文中，收集了一些比较常用的Javascript函数，希望对学习JS的朋友们有所帮助。

    1. 字符串长度截取

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    function cutstr(str, len) {
        var temp,
            icount = 0,
            patrn = /[^x00-xff]/，
            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. 替换全部

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

    3. 清除空格

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

    4. 清除左空格/右空格

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    function ltrim(s){ return s.replace( /^(s*| *)/, ""); }
    function rtrim(s){ return s.replace( /(s*| *)$/, ""); }

    5. 判断是否以某个字符串开头

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

    6. 判断是否以某个字符串结束

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

    7. 转义html标签

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

    8. 时间日期格式转换

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    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
    }

    9. 判断是否为数字类型

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

    10. 设置cookie值

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    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;"
    }

    11. 获取cookie值

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

    12. 加入收藏夹

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    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")
            }
        }
    }

    13. 设为首页

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    function setHomepage() {
        if (document.all) {
            document.body.style.behavior = 'url(#default#homepage)';
            document.body.setHomePage('http://w3cboy.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://w3cboy.com')
        }
    }

    14. 加载样式文件

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    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. 返回脚本内容

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    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. 清除脚本内容

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

    17. 动态加载脚本文件

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    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. 返回按ID检索的元素对象

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

    19. 跨浏览器绑定事件

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    function addEventSamp(obj,evt,fn){
        if(!oTarget){return;}
        if (obj.addEventListener) {
            obj.addEventListener(evt, fn, false);
        }else if(obj.attachEvent){
            obj.attachEvent('on'+evt,fn);
        }else{
            oTarget["on" + sEvtType] = fn;
        }
    }

    20. 跨浏览器删除事件

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    function delEvt(obj,evt,fn){
        if(!obj){return;}
        if(obj.addEventListener){
            obj.addEventListener(evt,fn,false);
        }else if(oTarget.attachEvent){
            obj.attachEvent("on" + evt,fn);
        }else{
            obj["on" + evt] = fn;
        }
    }

    21. 为元素添加on方法

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    Element.prototype.on = Element.prototype.addEventListener;
      
    NodeList.prototype.on = function (event, fn) {、
        []['forEach'].call(this, function (el) {
            el.on(event, fn);
        });
        return this;
    };

    22. 为元素添加trigger方法

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    Element.prototype.trigger = function (type, data) {
        var event = document.createEvent('HTMLEvents');
        event.initEvent(type, true, true);
        event.data = data || {};
        event.eventName = type;
        event.target = this;
        this.dispatchEvent(event);
        return this;
    };
    NodeList.prototype.trigger = function (event) {
        []['forEach'].call(this, function (el) {
            el['trigger'](event);
        });
        return this;
    };

    23. 检验URL链接是否有效

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    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);
             }
        }
    }

    24. 格式化CSS样式代码

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    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 { $2");
        s = s.replace(/([^s])}([^ ]*)/g, "$1 } $2");
        s = s.replace(/([^s]);([^s}])/g, "$1; $2");
        return s;
    }

    25. 压缩CSS样式代码

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    function compressCss (s) {//压缩代码
        s = s.replace(//*(.| )*?*//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];
    }

    26. 获取当前路径

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

    27. 判断是否移动设备

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    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;
    }

    28. 判断是否移动设备访问

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

    29. 判断是否苹果移动设备访问

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

    30. 判断是否安卓移动设备访问

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

    31. 判断是否Touch屏幕

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

    32. 判断是否打开视窗

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

    33. 获取移动设备初始化大小

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    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;
    }

    34. 获取移动设备最大化大小

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    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;
        }
    }

    35. 获取移动设备屏幕宽度

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    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;
    }

    36. 完美判断是否为网址

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    function IsURL(strUrl) {
        var regular = /^(((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)|(1dd)|([1-9]d)|d))(/[-a-z0-9_:@&?=+,.!/~%$]*)?)$/i
        if (regular.test(strUrl)) {
            return true;
        }else {
            return false;
        }
    }


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  • 原文地址：https://www.cnblogs.com/zhanghaiyang/p/7213307.html
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