feat(Field): add clear-trigger prop (#6699)

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

@@ -9,7 +9,7 @@ exports[`arrow-direction prop 1`] = `
 </div>
 `;
 
-exports[`clearable 1`] = `
+exports[`clearable prop 1`] = `
 <div class="van-cell van-field">
   <div class="van-cell__value van-cell__value--alone van-field__value">
     <div class="van-field__body"><input type="text" class="van-field__control"></div>
@@ -17,7 +17,7 @@ exports[`clearable 1`] = `
 </div>
 `;
 
-exports[`clearable 2`] = `
+exports[`clearable prop 2`] = `
 <div class="van-cell van-field">
   <div class="van-cell__value van-cell__value--alone van-field__value">
     <div class="van-field__body"><input type="text" class="van-field__control"><i class="van-icon van-icon-clear van-field__clear">

src/field/test/index.spec.js

@@ -184,7 +184,7 @@ test('maxlength', async () => {
   expect(wrapper.emitted('input')[0][0]).toEqual('123');
 });
 
-test('clearable', () => {
+test('clearable prop', () => {
   const wrapper = mount(Field, {
     propsData: {
       value: 'test',
@@ -202,6 +202,18 @@ test('clearable', () => {
   expect(wrapper.emitted('clear')[0][0]).toBeTruthy();
 });
 
+test('clear-trigger prop', () => {
+  const wrapper = mount(Field, {
+    propsData: {
+      value: 'test',
+      clearable: true,
+      clearTrigger: 'always',
+    },
+  });
+
+  expect(wrapper.contains('.van-field__clear')).toBeTruthy();
+});
+
 test('render input slot', () => {
   const wrapper = mount(Field, {
     scopedSlots: {