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js代码如下：

 function retrieveImageFromClipboardAsBase64(pasteEvent, callback, imageFormat){
        	if(pasteEvent.clipboardData == false){
                if(typeof(callback) == "function"){
                    callback(undefined);
                }
            };
        
            var items = pasteEvent.clipboardData.items;
        
            if(items == undefined){
                if(typeof(callback) == "function"){
                    callback(undefined);
                }
            };
        
            for (var i = 0; i < items.length; i++) {
                // Skip content if not image
                if (items[i].type.indexOf("image") == -1) continue;
                // Retrieve image on clipboard as blob
                var blob = items[i].getAsFile();
        
                // Create an abstract canvas and get context
                var mycanvas = document.createElement("canvas");
                var ctx = mycanvas.getContext('2d');
                
                // Create an image
                var img = new Image();
        
                // Once the image loads, render the img on the canvas
                img.onload = function(){
                    // Update dimensions of the canvas with the dimensions of the image
                    mycanvas.width = this.width;
                    mycanvas.height = this.height;
        
                    // Draw the image
                    ctx.drawImage(img, 0, 0);
        
                    // Execute callback with the base64 URI of the image
                    if(typeof(callback) == "function"){
                        callback(mycanvas.toDataURL(
                            (imageFormat || "image/png")
                        ));
                    }
                };
        
                // Crossbrowser support for URL
                var URLObj = window.URL || window.webkitURL;
        
                // Creates a DOMString containing a URL representing the object given in the parameter
                // namely the original Blob
                img.src = URLObj.createObjectURL(blob);
            }
        }
        
        
        window.addEventListener("paste", function(e){
        
            // Handle the event
            retrieveImageFromClipboardAsBase64(e, function(imageDataBase64){
                // If there's an image, open it in the browser as a new window :)
                if(imageDataBase64){
        
        
                
                    // data:image/png;base64,iVBORw0KGgoAAAAN......
                   console.log(imageDataBase64);
                }
            });
        }, false);

完整的html代码如下：

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">



</head>

<body>
    <p>
        点击这个页面，然后按住 <kbd>CTRL</kbd> + <kbd>V</kbd>.图片就会被粘贴进去了
    </p>
    <canvas style="border:1px solid grey;" id="mycanvas"></canvas>

    <script type="text/javascript">
        //通过剪贴板获取图片的blob数据
        function retrieveImageFromClipboardAsBlob(pasteEvent, callback){
        	if(pasteEvent.clipboardData == false){
                if(typeof(callback) == "function"){
                    callback(undefined);
                }
            };
        
            var items = pasteEvent.clipboardData.items;
        
            if(items == undefined){
                if(typeof(callback) == "function"){
                    callback(undefined);
                }
            };
        
            for (var i = 0; i < items.length; i++) {
                // Skip content if not image
                if (items[i].type.indexOf("image") == -1) continue;
                // Retrieve image on clipboard as blob
                var blob = items[i].getAsFile();
        
                if(typeof(callback) == "function"){
                    callback(blob);
                }
            }
        }
        
        window.addEventListener("paste", function(e){
        
            // Handle the event
            retrieveImageFromClipboardAsBlob(e, function(imageBlob){
                // If there's an image, display it in the canvas
                if(imageBlob){
                    var canvas = document.getElementById("mycanvas");
                    var ctx = canvas.getContext('2d');
                    
                    // Create an image to render the blob on the canvas
                    var img = new Image();
        
                    // Once the image loads, render the img on the canvas
                    img.onload = function(){
                        // Update dimensions of the canvas with the dimensions of the image
                        canvas.width = this.width;
                        canvas.height = this.height;
        
                        // Draw the image
                        ctx.drawImage(img, 0, 0);
                    };
        
                    // Crossbrowser support for URL
                    var URLObj = window.URL || window.webkitURL;
        
                    // Creates a DOMString containing a URL representing the object given in the parameter
                    // namely the original Blob
                    img.src = URLObj.createObjectURL(imageBlob);
                }
            });
        }, false);
        
        //听过剪贴板获取图片的base64格式数据
        function retrieveImageFromClipboardAsBase64(pasteEvent, callback, imageFormat){
        	if(pasteEvent.clipboardData == false){
                if(typeof(callback) == "function"){
                    callback(undefined);
                }
            };
        
            var items = pasteEvent.clipboardData.items;
        
            if(items == undefined){
                if(typeof(callback) == "function"){
                    callback(undefined);
                }
            };
        
            for (var i = 0; i < items.length; i++) {
                // Skip content if not image
                if (items[i].type.indexOf("image") == -1) continue;
                // Retrieve image on clipboard as blob
                var blob = items[i].getAsFile();
        
                // Create an abstract canvas and get context
                var mycanvas = document.createElement("canvas");
                var ctx = mycanvas.getContext('2d');
                
                // Create an image
                var img = new Image();
        
                // Once the image loads, render the img on the canvas
                img.onload = function(){
                    // Update dimensions of the canvas with the dimensions of the image
                    mycanvas.width = this.width;
                    mycanvas.height = this.height;
        
                    // Draw the image
                    ctx.drawImage(img, 0, 0);
        
                    // Execute callback with the base64 URI of the image
                    if(typeof(callback) == "function"){
                        callback(mycanvas.toDataURL(
                            (imageFormat || "image/png")
                        ));
                    }
                };
        
                // Crossbrowser support for URL
                var URLObj = window.URL || window.webkitURL;
        
                // Creates a DOMString containing a URL representing the object given in the parameter
                // namely the original Blob
                img.src = URLObj.createObjectURL(blob);
            }
        }
        
        
        window.addEventListener("paste", function(e){
        
            // Handle the event
            retrieveImageFromClipboardAsBase64(e, function(imageDataBase64){
                // If there's an image, open it in the browser as a new window :)
                if(imageDataBase64){
        
        
                
                    // data:image/png;base64,iVBORw0KGgoAAAAN......
                   console.log(imageDataBase64);
                }
            });
        }, false);
    </script>


</body>

</html>

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