el-input在表单里面点击Enter（回车键）会刷新页面问题

解决方案：
在 el-form 中 加个 @submit.native.prevent, 在el-input上增加@keydown.enter

<el-form :inline="true" :model="formInline" @submit.native.prevent>
     <el-form-item label="">
          <el-input placeholder="search for product" v-model="formInline.keyword" @keydown.native.enter="handleSearch">
              <div slot="suffix">
                <img class="input-search-suffix" src="@/static/images/enquire/search.png" @click.stop="handleSearch"/>
              </div>
         </el-input>
     </el-form-item>
</el-form>