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packages/button/index.js

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+import ElButton from './src/button';
+
+/* istanbul ignore next */
+ElButton.install = function(Vue) {
+  Vue.component(ElButton.name, ElButton);
+};
+
+export default ElButton;

packages/button/src/button-group.vue

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+<template>
+  <div class="el-button-group">
+    <slot></slot>
+  </div>
+</template>
+<script>
+  export default {
+    name: 'ElButtonGroup'
+  };
+</script>

packages/button/src/button.vue

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+<template>
+  <button
+    class="el-button"
+    @click="handleClick"
+    :disabled="buttonDisabled || loading"
+    :autofocus="autofocus"
+    :type="nativeType"
+    :class="[
+      type ? 'el-button--' + type : '',
+      buttonSize ? 'el-button--' + buttonSize : '',
+      {
+        'is-disabled': buttonDisabled,
+        'is-loading': loading,
+        'is-plain': plain,
+        'is-round': round,
+        'is-circle': circle
+      }
+    ]"
+  >
+    <i class="el-icon-loading" v-if="loading"></i>
+    <i :class="icon" v-if="icon && !loading"></i>
+    <span v-if="$slots.default"><slot></slot></span>
+  </button>
+</template>
+<script>
+  export default {
+    name: 'ElButton',
+
+    inject: {
+      elForm: {
+        default: ''
+      },
+      elFormItem: {
+        default: ''
+      }
+    },
+
+    props: {
+      type: {
+        type: String,
+        default: 'default'
+      },
+      size: String,
+      icon: {
+        type: String,
+        default: ''
+      },
+      nativeType: {
+        type: String,
+        default: 'button'
+      },
+      loading: Boolean,
+      disabled: Boolean,
+      plain: Boolean,
+      autofocus: Boolean,
+      round: Boolean,
+      circle: Boolean
+    },
+
+    computed: {
+      _elFormItemSize() {
+        return (this.elFormItem || {}).elFormItemSize;
+      },
+      buttonSize() {
+        return this.size || this._elFormItemSize || (this.$ELEMENT || {}).size;
+      },
+      buttonDisabled() {
+        return this.disabled || (this.elForm || {}).disabled;
+      }
+    },
+
+    methods: {
+      handleClick(evt) {
+        this.$emit('click', evt);
+      }
+    }
+  };
+</script>