feat(uni.event): 新增 uni.$off 的第二个参数为可选，不传递时移除所有监听

pages/API/event-bus/event-bus.test.js

@@ -51,4 +51,22 @@ describe('event-bus', () => {
     const l3 = (await page.data()).log.length
     expect(l3).toBe(0)
   })
+
+  it('off-all', async () => {
+    await page.callMethod('clear')
+    await page.callMethod('on')
+    await page.callMethod('on2')
+    await page.callMethod('emit')
+    const l1 = (await page.data()).log.length
+    expect(l1).toBe(2)
+
+    await page.callMethod('clear')
+    const l2 = (await page.data()).log.length
+    expect(l2).toBe(0)
+
+    await page.callMethod('offAll')
+    await page.callMethod('emit')
+    const l3 = (await page.data()).log.length
+    expect(l3).toBe(0)
+  })
 })

pages/API/event-bus/event-bus.uvue

@@ -6,6 +6,7 @@
       <button @click="on">开始监听</button>
       <button @click="once">监听一次</button>
       <button @click="off">取消监听</button>
+      <button @click="offAll">取消全部监听</button>
       <button @click="emit">触发监听</button>
       <button @click="clear">清空消息</button>
       <view class="box">
@@ -31,15 +32,25 @@
       fn(res : string) {
         this.log.push(res)
       },
+      fn2(res : string) {
+        this.log.push(res)
+      },
       on() {
         uni.$on('test', this.fn)
       },
+      on2() {
+        uni.$on('test', this.fn2)
+      },
       once() {
         uni.$once('test', this.fn)
       },
       off() {
         uni.$off('test', this.fn)
       },
+      offAll() {
+        // TODO 第二个参数为可选，后续优化后可不传递
+        uni.$off('test', null)
+      },
       emit() {
         uni.$emit('test', 'msg:' + Date.now())
       },