[bugfix] Field: label slot not work (#2872)

packages/field/index.js

@@ -216,7 +216,7 @@ export default sfc({
       icon: this.renderLeftIcon
     };
     if (slots('label')) {
-      scopedSlots.label = () => slots('title');
+      scopedSlots.title = () => slots('label');
     }
 
     return (

packages/field/test/__snapshots__/index.spec.js.snap

@@ -17,6 +17,15 @@ exports[`clearable 2`] = `
 </div>
 `;
 
+exports[`render label slot 1`] = `
+<div class="van-cell van-field">
+  <div class="van-cell__title van-field__label">Custom Label</div>
+  <div class="van-cell__value">
+    <div class="van-field__body"><input type="text" class="van-field__control"></div>
+  </div>
+</div>
+`;
+
 exports[`render textarea 1`] = `
 <div class="van-cell van-field">
   <div class="van-cell__value van-cell__value--alone">

packages/field/test/index.spec.js

@@ -163,3 +163,18 @@ test('clearable', () => {
   expect(wrapper.emitted('input')[0][0]).toEqual('');
   expect(wrapper.emitted('clear')).toBeTruthy();
 });
+
+test('render label slot', () => {
+  const wrapper = mount({
+    template: `
+      <field label="Default Label">
+        <template v-slot:label>Custom Label</template>
+      </field>
+    `,
+    components: {
+      Field
+    }
+  });
+
+  expect(wrapper).toMatchSnapshot();
+});