searchbox修改

components/SearchBox.vue

@@ -3,6 +3,7 @@
 		<input 
 		type="text" 
 		class="search_input" 
+		:placeholder="placeholder"
 		:value="value"
 		:focus="focused"
 		@input="handleChange($event)">
@@ -27,6 +28,7 @@
 			event: 'input'
 		},
 		props: {
+			placeholder: String,
 			value: String,
 			seaShow: {
 			  type: Boolean,