优化input组件的lazy属性;修复button的样式

src/form/button.wc

@@ -65,6 +65,7 @@
 }
 :host([size='large'][circle]) {
   min-width: 52px;
+  width: 52px;
   height: 52px;
 
   button {
@@ -81,6 +82,7 @@
 }
 :host([size='medium'][circle]) {
   min-width: 44px;
+  width: 44px;
 }
 :host([size='small']) {
   width: 96px;

src/form/input.wc

@@ -472,6 +472,7 @@ export default class Input {
     // 键盘事件
     this._handleSubmit = $.catch(this.__INPUT__, 'keydown', ev => {
       let { passwd } = this.props
+      let now = Date.now()
 
       if (this.disabled || this.readOnly) {
         return
@@ -491,6 +492,12 @@ export default class Input {
           return this._fetchSelect(this.state.mvidx, ev)
         }
 
+        // 并发拦截
+        if (lazy && now - this.stamp < lazy) {
+          return
+        }
+
+        this.stamp = now
         this.dispatchEvent(new CustomEvent('submit', { detail: this.value }))
       }
     })