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packages/upload/src/upload-dragger.vue

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+<template>
+  <div
+    class="el-upload-dragger"
+    :class="{
+      'is-dragover': dragover
+    }"
+    @drop.prevent="onDrop"
+    @dragover.prevent="onDragover"
+    @dragleave.prevent="dragover = false"
+  >
+    <slot></slot>
+  </div>
+</template>
+<script>
+  export default {
+    name: 'ElUploadDrag',
+    props: {
+      disabled: Boolean
+    },
+    inject: {
+      uploader: {
+        default: ''
+      }
+    },
+    data() {
+      return {
+        dragover: false
+      };
+    },
+    methods: {
+      onDragover() {
+        if (!this.disabled) {
+          this.dragover = true;
+        }
+      },
+      onDrop(e) {
+        if (this.disabled || !this.uploader) return;
+        const accept = this.uploader.accept;
+        this.dragover = false;
+        if (!accept) {
+          this.$emit('file', e.dataTransfer.files);
+          return;
+        }
+        this.$emit('file', [].slice.call(e.dataTransfer.files).filter(file => {
+          const { type, name } = file;
+          const extension = name.indexOf('.') > -1
+            ? `.${ name.split('.').pop() }`
+            : '';
+          const baseType = type.replace(/\/.*$/, '');
+          return accept.split(',')
+            .map(type => type.trim())
+            .filter(type => type)
+            .some(acceptedType => {
+              if (/\..+$/.test(acceptedType)) {
+                return extension === acceptedType;
+              }
+              if (/\/\*$/.test(acceptedType)) {
+                return baseType === acceptedType.replace(/\/\*$/, '');
+              }
+              if (/^[^\/]+\/[^\/]+$/.test(acceptedType)) {
+                return type === acceptedType;
+              }
+              return false;
+            });
+        }));
+      }
+    }
+  };
+</script>
+