feat(Form): support using switch

src/switch/index.js

@@ -0,0 +1,73 @@
+// Utils
+import { createNamespace, addUnit } from '../utils';
+import { BLUE } from '../utils/constant';
+import { switchProps } from './shared';
+
+// Mixins
+import { FieldMixin } from '../mixins/field';
+
+// Components
+import Loading from '../loading';
+
+const [createComponent, bem] = createNamespace('switch');
+
+export default createComponent({
+  mixins: [FieldMixin],
+
+  props: switchProps,
+
+  computed: {
+    checked() {
+      return this.value === this.activeValue;
+    },
+
+    style() {
+      return {
+        fontSize: addUnit(this.size),
+        backgroundColor: this.checked ? this.activeColor : this.inactiveColor,
+      };
+    },
+  },
+
+  methods: {
+    onClick(event) {
+      this.$emit('click', event);
+
+      if (!this.disabled && !this.loading) {
+        const newValue = this.checked ? this.inactiveValue : this.activeValue;
+        this.$emit('input', newValue);
+        this.$emit('change', newValue);
+      }
+    },
+
+    genLoading() {
+      if (this.loading) {
+        const color = this.checked
+          ? this.activeColor || BLUE
+          : this.inactiveColor || '';
+
+        return <Loading class={bem('loading')} color={color} />;
+      }
+    },
+  },
+
+  render() {
+    const { checked, loading, disabled } = this;
+
+    return (
+      <div
+        class={bem({
+          on: checked,
+          loading,
+          disabled,
+        })}
+        role="switch"
+        style={this.style}
+        aria-checked={String(checked)}
+        onClick={this.onClick}
+      >
+        <div class={bem('node')}>{this.genLoading()}</div>
+      </div>
+    );
+  },
+});