feat: 增加button图标功能

src/packages/button/demo.vue

@@ -30,12 +30,21 @@
     <h2>加载状态</h2>
 
     <h2>图标按钮</h2>
+    <div class="demo-button-row2">
+      <nut-button
+        shape="square"
+        plain
+        type="primary"
+        icon="star-fill"
+      ></nut-button>
+      <nut-button shape="square" type="primary" icon="star">收藏</nut-button>
+    </div>
 
     <h2>按钮尺寸</h2>
     <div class="demo-button-row2">
-      <div class="demo-button-row2">
-        <nut-button size="large" type="primary">大号按钮</nut-button>
-      </div>
+      <nut-button size="large" type="primary" style="margin-bottom: 10px"
+        >大号按钮</nut-button
+      >
       <nut-button type="primary">普通按钮</nut-button>
       <nut-button size="small" type="primary">小型按钮</nut-button>
     </div>
@@ -68,9 +77,11 @@ export default createDemo({
 <style lang="scss" scoped>
 .demo-button-row {
   margin-bottom: 20px;
+  margin-left: 15px;
 }
 .demo-button-row2 {
   margin-bottom: 10px;
+  margin-left: 15px;
 }
 .nut-button {
   margin-right: 15px;

src/packages/button/index.scss

@@ -13,6 +13,9 @@
   -webkit-appearance: none;
   user-select: none;
   touch-action: manipulation;
+  .text {
+    margin-left: 5px;
+  }
   &::before {
     position: absolute;
     top: 50%;

src/packages/button/index.vue

 <template>
   <view :class="classes" :style="getStyle" @click="handleClick">
-    <!-- <i class="nut-icon-loading" v-if="loading"></i> -->
-    <!-- <i :class="icon" v-if="icon && !loading"></i> -->
-    <slot></slot>
+    <nut-icon class="nut-icon-loading" v-if="loading"></nut-icon>
+    <nut-icon :class="icon" v-if="icon && !loading" :name="icon"></nut-icon>
+    <view :class="{ text: icon || loading }" v-if="$slots.default"
+      ><slot></slot
+    ></view>
   </view>
 </template>
 
@@ -51,6 +53,10 @@ export default create({
     block: {
       type: Boolean,
       default: false
+    },
+    icon: {
+      type: String,
+      default: ''
     }
   },
   components: {},