一、使用 input type=“file” 标签
cmp
<!--上传文件界面-->
<div>{!v.fileMessage}</div>
<div class="slds-file-selector__dropzone" style="height:200px;width: 98%;margin-top:10px" ondragleave="{!c.ondragleave}" ondrop="{!c.ondrop}" ondragenter="{!c.ondragenter}">
<input type="file" class="slds-file-selector__input slds-assistive-text" id="file-upload-input-01" aria-labelledby="file-selector-primary-label file-selector-secondary-label" onchange="{
!c.uploadFile}" />
<label class="slds-file-selector__body" for="file-upload-input-01" id="file-selector-secondary-label">
<span class="slds-file-selector__button slds-button slds-button_neutral" style="left:45%; top:90px;color:black;">
文件上传</span>
</label>
<br />
<aura:iteration items="{!v.fileList}" var="item" indexVar="index">
<lightning:buttonIcon iconName="utility:close" variant="bare" onclick="{
! c.shanchu }