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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/api/datatransferitem/getasfile | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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Diffstat (limited to 'files/zh-cn/web/api/datatransferitem/getasfile')
-rw-r--r-- | files/zh-cn/web/api/datatransferitem/getasfile/index.html | 94 |
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diff --git a/files/zh-cn/web/api/datatransferitem/getasfile/index.html b/files/zh-cn/web/api/datatransferitem/getasfile/index.html new file mode 100644 index 0000000000..c1f1326629 --- /dev/null +++ b/files/zh-cn/web/api/datatransferitem/getasfile/index.html @@ -0,0 +1,94 @@ +--- +title: DataTransferItem.getAsFile() +slug: Web/API/DataTransferItem/getAsFile +tags: + - API + - DataTransferItem +translation_of: Web/API/DataTransferItem/getAsFile +--- +<div>{{APIRef("HTML Drag and Drop API")}}</div> + +<p>如果<strong><code>DataTransferItem</code></strong>是一个文件, 那 <strong><code>DataTransferItem.getAsFile()</code></strong> 方法将返回拖拽项数据的 {{domxref("File")}} 对象. 如果拖拽项的数据不是一个文件,则返回 <code>null</code>.</p> + +<h2 id="语法">语法</h2> + +<pre class="syntaxbox"><em>File</em> = <em>DataTransferItem</em>.getAsFile(); +</pre> + +<h3 id="参数">参数</h3> + +<p><em>无.</em></p> + +<h3 id="返回值">返回值</h3> + +<dl> + <dt>{{domxref("File")}}</dt> + <dd>如果拖拽项的对象是一个文件, 则返回 {{domxref("File")}} 对象; 否则返回 <code>null</code> .</dd> +</dl> + +<h2 id="例子">例子</h2> + +<p>下面这个例子中使用 <code>getAsFile()</code> 。放在 {{event("drop")}} 事件处理里面.</p> + +<pre class="brush: js">function drop_handler(ev) { + console.log("Drop"); + ev.preventDefault(); + var data = event.dataTransfer.items; + for (var i = 0; i < data.length; i += 1) { + if ((data[i].kind == 'string') && + (data[i].type.match('^text/plain'))) { + // 遍历拖拽项的内容 + data[i].getAsString(function (s){ + ev.target.appendChild(document.getElementById(s)); + }); + } else if ((data[i].kind == 'string') && + (data[i].type.match('^text/html'))) { + // 拖拽项的数据是 HTML + console.log("... Drop: HTML"); + } else if ((data[i].kind == 'string') && + (data[i].type.match('^text/uri-list'))) { + // 拖拽项的数据是URI + console.log("... Drop: URI"); + } else if ((data[i].kind == 'file') && + (data[i].type.match('^image/'))) { + // 拖拽项的数据是一个图片 + var f = data[i].getAsFile(); + console.log("... Drop: File "); + } + } +} +</pre> + +<h2 id="规范">规范</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + <tr> + <td>{{SpecName('HTML WHATWG', 'interaction.html#dom-datatransferitem-getasfile','getAsFile()')}}</td> + <td>{{Spec2('HTML WHATWG')}}</td> + <td>Initial value</td> + </tr> + <tr> + <td>{{SpecName('HTML5.1', 'editing.html#dom-datatransferitem-getasfile','getAsFile()')}}</td> + <td>{{Spec2('HTML5.1')}}</td> + <td>Snapshot of the HTML WHATWG document</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容">浏览器兼容</h2> + + + +<p>{{Compat("api.DataTransferItem.getAsFile")}}</p> + +<h2 id="查看更多">查看更多</h2> + +<ul> + <li>{{domxref("DataTransfer.files()")}}</li> +</ul> |