类似下面这段官方的代码:
<el-upload
class="upload-demo"
action="https://jsonplaceholder.typicode.com/posts/"
:on-preview="handlePreview"
:on-remove="handleRemove"
:before-remove="beforeRemove"
multiple
:limit="3"
:on-exceed="handleExceed"
:file-list="fileList">
<el-button size="small" type="primary">点击上传</el-button>
<div slot="tip" class="el-upload__tip">只能上传jpg/png文件,且不超过500kb</div>
</el-upload>
我想问的是像 class aciton 是直接就这么些了,但为什么有的属性前面要加 :?比如 limit file-list 之类,官方文档里我貌似没找到两种写法的区别?
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