file

var files = document.getElementById('file').files;

var dropZone = document.querySelector('#dropZone');

dropZone.addEventListener("dragenter", function (e) {
  e.preventDefault();
  e.stopPropagation();
}, false);
 
dropZone.addEventListener("dragover", function (e) {
  e.preventDefault();
  e.stopPropagation();
}, false);
 
dropZone.addEventListener("dragleave", function (e) {
  e.preventDefault();
  e.stopPropagation();
}, false);
 
dropZone.addEventListener("drop", function (e) {
  e.preventDefault();
  e.stopPropagation();
  // 处理拖拽文件的逻辑
}

dropZone.addEventListener("drop", function (e) {
  e.preventDefault();
  e.stopPropagation();
  
  var df = e.dataTransfer;
  var dropFiles = []; // 存放拖拽的文件对象
  
  if(df.items !== undefined) {
    // Chrome有items属性，对Chrome的单独处理
    for(var i = 0; i < df.items.length; i++) {
      var item = df.items[i];
      // 用webkitGetAsEntry禁止上传目录
      if(item.kind === "file" && item.webkitGetAsEntry().isFile) {
        var file = item.getAsFile();
        dropFiles.push(file);
      }
    }
  }
}

dropArea.addEventListener("drop", e => {
	let items = e.dataTransfer.items;
	for (let i = 0; i <= items.length - 1; i++) {
		let item = items[i];
		if (item.kind === "file") {
			// FileSystemFileEntry 或 FileSystemDirectoryEntry 对象
			let entry = item.webkitGetAsEntry();
			// 递归地获取entry下包含的所有File
			this.getFileFromEntryRecursively(entry);
		}
	}
	e.preventDefault();
});

getFileFromEntryRecursively(entry) {
      if (entry.isFile) {
        entry.file(
          file => {
            this.addFileToList({ file, path: entry.fullPath });
          },
          e => { console.log(e); }
        );
      } else {
        let reader = entry.createReader();
        reader.readEntries(
          entries => {
            entries.forEach(entry => this.getFileFromEntryRecursively(entry));
          },
          e => { console.log(e); }
        );
      }
}

class SuperUploader{

    constructor({ uploadFileEl, uploadDirectoryEl, dropAreaEl, successCallback }) {
        uploadFileEl && this.initUploadFile(uploadFileEl, successCallback);
        uploadDirectoryEl && this.initUploadDirectory(uploadDirectoryEl, successCallback);
        dropAreaEl && this.initDragAndDrop(dropAreaEl, successCallback);
    }


    initUploadFile(el, successCallback) {
        const oRealButton = document.createElement("input");
        oRealButton.setAttribute("type", "file");
        oRealButton.setAttribute("multiple", true);
        oRealButton.style.display = "none";
        oRealButton.addEventListener("change", e => {
            let files = oRealButton.files;
            for (let i = 0; i <= files.length - 1; i++) {
                let file = files[i];
                // 这里的 file.webkitRelativePath 都是 "" ,不是我们想要的.要用 file.name
                successCallback({ file, path: file.name });
            }
        })
        document.body.appendChild(oRealButton);
        el.addEventListener("click", e => {
            oRealButton.click();
        });
    }

    initUploadDirectory(el, successCallback) {
        const oRealButton = document.createElement("input");
        oRealButton.setAttribute("type", "file");
        oRealButton.setAttribute("webkitdirectory", true);
        oRealButton.style.display = "none";
        oRealButton.addEventListener("change", e => {
            let files = oRealButton.files;
            for (let i = 0; i <= files.length - 1; i++) {
                let file = files[i];
                // 这里的 file.webkitRelativePath 就是我们想要的格式
                successCallback({ file, path: file.webkitRelativePath });
            }
        })
        document.body.appendChild(oRealButton);
        el.addEventListener("click", e => {
            oRealButton.click();
        });
    }

    initDragAndDrop(el, successCallback) {
        el.addEventListener("dragover", e => {
            e.preventDefault();
        });
        el.addEventListener("drop", e => {
            let items = e.dataTransfer.items;
            for (let i = 0; i <= items.length - 1; i++) {
                let item = items[i];
                if (item.kind === "file") {
                    let entry = item.webkitGetAsEntry();
                    this.getFileFromEntryRecursively(entry, successCallback);
                }
            }
            e.preventDefault();
        });
    }

    getFileFromEntryRecursively(entry, successCallback) {
        if (entry.isFile) {
            entry.file(file => {
                // 这里的 file.webkitRelativePath 都是 "" ,不是我们想要的.
                // entry.fullPath 是前面带斜杠的,要把斜杠去掉的
                let path = entry.fullPath.substring(1);
                successCallback({ file, path });
            }, e => { console.log(e); });
        } else {
            let reader = entry.createReader();
            reader.readEntries(entries => {
                entries.forEach(entry => this.getFileFromEntryRecursively(entry, successCallback));
            }, e => { console.log(e); });
        }
    }
}

//读取图片实例,并上传到服务器
var fileBox = document.getElementById('file');
fileBox.onchange = function () {
    //获取选择文件的数组
    var fileList = fileBox.files;
    for (var i = 0; i < fileList.length; i++) {
        var file = fileList[i];
        uploadFile(file);
    }
}
//关键代码上传到服务器
function uploadFile(file) {
    var reader = new FileReader();
    reader.readAsArrayBuffer(file);
    reader.onload = function () {
        var blob = new Blob([reader.result]);
        //提交到服务器
        var fd = new FormData();
        fd.append('file', blob);
        var ext = file.name.substring(file.name.lastIndexOf('.'));
        fd.append('extention', ext);
        fd.append('maxsize', 1024*1024*4);//Asp.net 默认一次上传最大4MB
        fd.append('isClip', -1);
        var xhr = new XMLHttpRequest();
        xhr.open('post', '../ashx/upload.ashx', true);
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4 && xhr.status == 200) {
                var data = eval('(' + xhr.responseText + ')');
                console.info(data);
                if (data.success) {
                    //上传成功
                    var imgName = data.msg;
                    alert(imgName);
                } else {
                    alert(data.msg);
                }
            }
        }
        //开始发送
        xhr.send(fd);
    }
}

//读取图片内容 为DataURL
function readFile(file) {
    var reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = function (e) {
        var result = reader.result;
        $('.container blockquote').text(result);
        $('#img1').attr('src', result)
    }
}

//读取图片实例,并上传到服务器
var fileBox = document.getElementById('file');
fileBox.onchange = function () {
    //获取选择文件的数组
    var fileList = fileBox.files;
    for (var i = 0; i < fileList.length; i++) {
        var file = fileList[i];
        //图片类型验证第二种方式
        if (/image\/\w+/.test(file.type))
            readFile(file);
        else
            console.log(file.name + ':不是图片');
    }
}


//关键代码上传到服务器
function uploadFile(file) {
    var reader = new FileReader();
    reader.readAsArrayBuffer(file);
    reader.onload = function () {
        var blob = new Blob([reader.result], { type: 'image/jpg' });
        //提交到服务器
        var fd = new FormData();
        fd.append('file', blob);
        var ext = file.name.substring(file.name.lastIndexOf('.'));
        fd.append('extention', ext);
        fd.append('isClip', -1);
        var xhr = new XMLHttpRequest();
        xhr.open('post', '../ashx/upload.ashx', true);
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4 && xhr.status == 200) {
                var data = eval('(' + xhr.responseText + ')');
                console.info(data);
                if (data.success) {
                    //上传成功
                    var imgName = data.msg;
                    alert(imgName);
                } else {
                    alert(data.msg);
                }
            }
        }
        //开始发送
        xhr.send(fd);
    }
}

//读取二进制图片文件，并上传到服务器
function uploadClick() {
    var fileList = fileBox.files;
    for (var i = 0; i < fileList.length; i++) {
        var file = fileList[i];
        //图片类型验证第二种方式
        if (/image\/\w+/.test(file.type))
            uploadFile(file);
        else
            console.log(file.name + ':不是图片');
    }
}