复制剪贴板功能分为两部分：ie 浏览器和非 ie 浏览器，ie 浏览器可以使用 clipboardData 对象，而非 ie 浏览器则利用 flash 与 js 的结合来实现，即 ZeroClipboard.js。
clipboardData 对象只有 ie 浏览器认识，该对象有 3 个方法： clearData， getData和 setData。
| 方法 | 描述 |
|---|---|
| clearData | 通过 dataTransfer 或 clipboardData 对象从剪贴板删除一种或多种数据格式。 |
| getData | 通过 dataTransfer 或 clipboardData 对象从剪贴板获取指定格式的数据。 |
| setData | 以指定格式给 dataTransfer 或 clipboardData 对象赋予数据。 |
对于非 ie 浏览器我们可以使用 ZeroClipboard.js。
利用透明的 flash 覆盖在复制按钮上，点击 flash，将复制内容传入到 flash 中，再通过 flash 把传入的内容写到剪贴板上。
首先需要把 flash 和 js 放到同一目录下，然后引用 js。如果 flash 和 js 不在同一目录，可以通过 ZeroClipboard.setMoviePath('Flash路径');来设置 flash 路径，或者修改源码中的 moviePath。
function clipboard(text, button, msg, parent) { var clip = new ZeroClipboard.Client(); // 新建一个对象 clip.setHandCursor(true); clip.setText(text); // 设置要复制的文本。 clip.addEventListener('mouseUp', function(client) { alert(msg); }); // 注册一个 button，参数为 id。点击这个 button 就会复制。 //这个 button 不一定是 input 按钮，也可以是其他 DOM 元素。 clip.glue(button, parent);}
function clipboard(text, button, msg, parent) { if(window.clipboardData) { //for ie var oBtn = document.getElementById(button); oBtn.onclick = function() { window.clipboardData.setData('text', text); alert(msg); } } else { var clip = new ZeroClipboard.Client(); clip.setHandCursor(true); clip.setText(text); clip.addEventListener('mouseUp', function(client) { alert(msg); }); clip.glue(button, parent); } return false;}
// Simple Set Clipboard System// Author: Joseph Huckabyvar ZeroClipboard = { version: "1.0.7", clients: {}, // registered upload clients on page, indexed by id moviePath: 'ZeroClipboard.swf', // URL to movie nextId: 1, // ID of next movie $: function(thingy) { // simple DOM lookup utility function if (typeof(thingy) == 'string') thingy = document.getElementById(thingy); if (!thingy.addClass) { // extend element with a few useful methods thingy.hide = function() { this.style.display = 'none'; }; thingy.show = function() { this.style.display = ''; }; thingy.addClass = function(name) { this.removeClass(name); this.className += ' ' + name; }; thingy.removeClass = function(name) { var classes = this.className.split(/\s+/); var idx = -1; for (var k = 0; k < classes.length; k++) { if (classes[k] == name) { idx = k; k = classes.length; } } if (idx > -1) { classes.splice( idx, 1 ); this.className = classes.join(' '); } return this; }; thingy.hasClass = function(name) { return !!this.className.match( new RegExp("\\s*" + name + "\\s*") ); }; } return thingy; }, setMoviePath: function(path) { // set path to ZeroClipboard.swf this.moviePath = path; }, dispatch: function(id, eventName, args) { // receive event from flash movie, send to client var client = this.clients[id]; if (client) { client.receiveEvent(eventName, args); } }, register: function(id, client) { // register new client to receive events this.clients[id] = client; }, getDOMObjectPosition: function(obj, stopObj) { // get absolute coordinates for dom element var info = { left: 0, top: 0, width: obj.width ? obj.width : obj.offsetWidth, height: obj.height ? obj.height : obj.offsetHeight }; while (obj && (obj != stopObj)) { info.left += obj.offsetLeft; info.top += obj.offsetTop; obj = obj.offsetParent; } return info; }, Client: function(elem) { // constructor for new simple upload client this.handlers = {}; // unique ID this.id = ZeroClipboard.nextId++; this.movieId = 'ZeroClipboardMovie_' + this.id; // register client with singleton to receive flash events ZeroClipboard.register(this.id, this); // create movie if (elem) this.glue(elem); }};ZeroClipboard.Client.prototype = { id: 0, // unique ID for us ready: false, // whether movie is ready to receive events or not movie: null, // reference to movie object clipText: '', // text to copy to clipboard handCursorEnabled: true, // whether to show hand cursor, or default pointer cursor cssEffects: true, // enable CSS mouse effects on dom container handlers: null, // user event handlers glue: function(elem, appendElem, stylesToAdd) { // glue to DOM element // elem can be ID or actual DOM element object this.domElement = ZeroClipboard.$(elem); // float just above object, or zIndex 99 if dom element isn't set var zIndex = 9999; if (this.domElement.style.zIndex) { zIndex = parseInt(this.domElement.style.zIndex, 10) + 1; } if (typeof(appendElem) == 'string') { appendElem = ZeroClipboard.$(appendElem); } else if (typeof(appendElem) == 'undefined') { appendElem = document.getElementsByTagName('body')[0]; } // find X/Y position of domElement var box = ZeroClipboard.getDOMObjectPosition(this.domElement, appendElem); // create floating DIV above element this.div = document.createElement('div'); var style = this.div.style; style.position = 'absolute'; style.left = '' + box.left + 'px'; style.top = '' + box.top + 'px'; style.width = '' + box.width + 'px'; style.height = '' + box.height + 'px'; style.zIndex = zIndex; if (typeof(stylesToAdd) == 'object') { for (addedStyle in stylesToAdd) { style[addedStyle] = stylesToAdd[addedStyle]; } } // style.backgroundColor = '#f00'; // debug appendElem.appendChild(this.div); this.div.innerHTML = this.getHTML( box.width, box.height ); }, getHTML: function(width, height) { // return HTML for movie var html = ''; var flashvars = 'id=' + this.id + '&width=' + width + '&height=' + height; if (navigator.userAgent.match(/MSIE/)) { // IE gets an OBJECT tag var protocol = location.href.match(/^https/i) ? 'https://' : 'http://'; html += '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="'+protocol+'download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="'+width+'" height="'+height+'" id="'+this.movieId+'" align="middle"><param name="allowScriptAccess" value="always" /><param name="allowFullScreen" value="false" /><param name="movie" value="'+ZeroClipboard.moviePath+'" /><param name="loop" value="false" /><param name="menu" value="false" /><param name="quality" value="best" /><param name="bgcolor" value="#ffffff" /><param name="flashvars" value="'+flashvars+'"/><param name="wmode" value="transparent"/></object>'; } else { // all other browsers get an EMBED tag html += '<embed id="'+this.movieId+'" src="'+ZeroClipboard.moviePath+'" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="'+width+'" height="'+height+'" name="'+this.movieId+'" align="middle" allowScriptAccess="always" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="'+flashvars+'" wmode="transparent" />'; } return html; }, hide: function() { // temporarily hide floater offscreen if (this.div) { this.div.style.left = '-2000px'; } }, show: function() { // show ourselves after a call to hide() this.reposition(); }, destroy: function() { // destroy control and floater if (this.domElement && this.div) { this.hide(); this.div.innerHTML = ''; var body = document.getElementsByTagName('body')[0]; try { body.removeChild( this.div ); } catch(e) {;} this.domElement = null; this.div = null; } }, reposition: function(elem) { // reposition our floating div, optionally to new container // warning: container CANNOT change size, only position if (elem) { this.domElement = ZeroClipboard.$(elem); if (!this.domElement) this.hide(); } if (this.domElement && this.div) { var box = ZeroClipboard.getDOMObjectPosition(this.domElement); var style = this.div.style; style.left = '' + box.left + 'px'; style.top = '' + box.top + 'px'; } }, setText: function(newText) { // set text to be copied to clipboard this.clipText = newText; if (this.ready) this.movie.setText(newText); }, addEventListener: function(eventName, func) { // add user event listener for event // event types: load, queueStart, fileStart, fileComplete, queueComplete, progress, error, cancel eventName = eventName.toString().toLowerCase().replace(/^on/, ''); if (!this.handlers[eventName]) this.handlers[eventName] = []; this.handlers[eventName].push(func); }, setHandCursor: function(enabled) { // enable hand cursor (true), or default arrow cursor (false) this.handCursorEnabled = enabled; if (this.ready) this.movie.setHandCursor(enabled); }, setCSSEffects: function(enabled) { // enable or disable CSS effects on DOM container this.cssEffects = !!enabled; }, receiveEvent: function(eventName, args) { // receive event from flash eventName = eventName.toString().toLowerCase().replace(/^on/, ''); // special behavior for certain events switch (eventName) { case 'load': // movie claims it is ready, but in IE this isn't always the case... // bug fix: Cannot extend EMBED DOM elements in Firefox, must use traditional function this.movie = document.getElementById(this.movieId); if (!this.movie) { var self = this; setTimeout( function() { self.receiveEvent('load', null); }, 1 ); return; } // firefox on pc needs a "kick" in order to set these in certain cases if (!this.ready && navigator.userAgent.match(/Firefox/) && navigator.userAgent.match(/Windows/)) { var self = this; setTimeout( function() { self.receiveEvent('load', null); }, 100 ); this.ready = true; return; } this.ready = true; this.movie.setText( this.clipText ); this.movie.setHandCursor( this.handCursorEnabled ); break; case 'mouseover': if (this.domElement && this.cssEffects) { this.domElement.addClass('hover'); if (this.recoverActive) this.domElement.addClass('active'); } break; case 'mouseout': if (this.domElement && this.cssEffects) { this.recoverActive = false; if (this.domElement.hasClass('active')) { this.domElement.removeClass('active'); this.recoverActive = true; } this.domElement.removeClass('hover'); } break; case 'mousedown': if (this.domElement && this.cssEffects) { this.domElement.addClass('active'); } break; case 'mouseup': if (this.domElement && this.cssEffects) { this.domElement.removeClass('active'); this.recoverActive = false; } break; } // switch eventName if (this.handlers[eventName]) { for (var idx = 0, len = this.handlers[eventName].length; idx < len; idx++) { var func = this.handlers[eventName][idx]; if (typeof(func) == 'function') { // actual function reference func(this, args); } else if ((typeof(func) == 'object') && (func.length == 2)) { // PHP style object + method, i.e. [myObject, 'myMethod'] func[0][ func[1] ](this, args); } else if (typeof(func) == 'string') { // name of function window[func](this, args); } } // foreach event handler defined } // user defined handler for event } };
