实现复制或截图可直接粘贴图片

var input = document.getElementsByTagName("textarea")[0];
input.addEventListener(‘paste‘, pasteHandler);

/*Handle paste event*/
function pasteHandler(e){    //e:  ClipboardEvent
    //check if event.clipboardData is supported(chrome)
    if(e.clipboardData){
        var items = e.clipboardData.items;
        if(items){
            for(var i=0;i<items.length;i++){
                if(items[i].kind == ‘file‘ || items[i].type.indexOf(‘image‘) > -1){
                    //need to represent the image as a file
                    var blob = items[i].getAsFile();

                    var reader = new FileReader();
                    //need base64 to upload to server
                    reader.readAsDataURL(blob);
                    reader.onload = function(e) {   // ProgressEvent
                        uploadFile(e.target.result);  //or reader.result
                    }
                }
            }
        }
    }
};


var uploadFile = function (src) {
    var fileBase64 = src.split(",")[1];
    var data = [{
        base64: fileBase64
    }];
    $.ajax({
        type: "POST",
        url: "/feedback/attach/upload",
        data: JSON.stringify({data:data}),
        dataType: "json",
        contentType: "application/json",
        success: function(data){
            if (200 == data.code && data.msg.attachments && data.msg.attachments.length) {
                var attachs = data.msg.attachments;

                var liNode = document.createElement("li");
                var imageNode = document.createElement(‘img‘);
                imageNode.setAttribute(‘src‘,attachs[0].thumbUrl);
                $(liNode).attr("data-fileId", attachs[0].fileId);
                $(liNode).attr("data-url", attachs[0].url);

                liNode.appendChild(imageNode);
                document.getElementById(‘images-paste‘).appendChild(liNode);

            }
        },
        error: function(err){
            console.log(err);
        }
    });
};