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+---
+title: ArrayBuffer.transfer()
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/transfer
+translation_of: Archive/Web/JavaScript/ArrayBuffer.transfer
+---
+<div>{{JSRef}} {{SeeCompatTable}}</div>
+
+<p> 静态<code><strong>ArrayBuf</strong></code><strong>fer.transfer()</strong> 方法返回一个新的ArrayBuffer， 其内容取自oldBuffer的数据，并且根据 newByteLength 的大小来对数据进行截取或者以0扩展。 如果 newByteLength 未定义，则使用 oldBuffer 的byteLength。这个操作使得 oldBuffer 处于被移除的状态。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">ArrayBuffer.transfer(oldBuffer [, newByteLength]);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>oldBuffer</code></dt>
+ <dd> 要转移的{{jsxref("ArrayBuffer")}}对象。</dd>
+ <dt>newByteLength</dt>
+ <dd>新 <code>ArrayBuffer</code> 对象的字节长度。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的ArrayBuffer对象。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>ArrayBuffer.transfer()</code>方法允许你增长和移除 <code>ArrayBuffer</code> 对象。不需复制就能增长一个ArrayBuffer的功能，对于大的缓冲区来说，有速度优势 (类似realloc) 。当释放底层内存时，移除ArrayBuffer的功能给开发者提供了显式控制。这避免了必须丢弃所有引用和等待垃圾回收。</p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">var buf1 = new ArrayBuffer(40);
+new Int32Array(buf1)[0] = 42;
+
+var buf2 = ArrayBuffer.transfer(buf1, 80);
+buf1.byteLength; // 0 but if you use the polyfill then the value is still 40
+buf2.byteLength; // 80
+new Int32Array(buf2)[0]; // 42
+
+var buf3 = ArrayBuffer.transfer(buf2, 0);
+buf2.byteLength; // 0 but if you use the polyfill then the value is still 80
+buf3.byteLength; // 0
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>You can partially work around this by inserting the following code at the beginning of your scripts, allowing use of much of the functionality of transfer<font face="Consolas, Liberation Mono, Courier, monospace">()</font> in implementations that do not natively support it. This is not the exact equivalent of this API, but this function transfers data from one ArrayBuffer to another ArrayBuffer.</p>
+
+<pre>if(!ArrayBuffer.transfer) {
+    ArrayBuffer.transfer = function (source, length) {
+        source = Object(source);
+        var dest = new ArrayBuffer(length);
+        if(!(source instanceof ArrayBuffer) || !(dest instanceof ArrayBuffer)) {
+            throw new TypeError("Source and destination must be ArrayBuffer instances");
+        }
+        if(dest.byteLength &gt;= source.byteLength) {
+            var nextOffset = 0;
+            var leftBytes = source.byteLength;
+            var wordSizes = [8, 4, 2, 1];
+            wordSizes.forEach(function (_wordSize_) {
+                if (leftBytes &gt;= _wordSize_) {
+                    var done = transferWith(_wordSize_, source, dest, nextOffset, leftBytes);
+                    nextOffset = done.nextOffset;
+                    leftBytes = done.leftBytes;
+                }
+            });
+        }
+        return dest;
+        function transferWith(wordSize, source, dest, nextOffset, leftBytes) {
+            var ViewClass = Uint8Array;
+            switch (wordSize)  {
+                case 8:
+                    ViewClass = Float64Array;
+                    break;
+                case 4:
+                    ViewClass = Float32Array;
+                    break;
+                case 2:
+                    ViewClass = Uint16Array;
+                    break;
+                case 1:
+                    ViewClass = Uint8Array;
+                    break;
+                default:
+                    ViewClass = Uint8Array;
+                    break;
+            }
+            var view_source = new ViewClass(source, nextOffset, Math.trunc(leftBytes / wordSize));
+            var view_dest = new ViewClass(dest, nextOffset, Math.trunc(leftBytes / wordSize));
+            for(var i=0; i&lt;view_dest.length; i++) {
+                view_dest[i] = view_source[i];
+            }
+            return {
+                nextOffset : view_source.byteOffset + view_source.byteLength,
+                leftBytes : source.byteLength - (view_source.byteOffset + view_source.byteLength)
+            }
+        }
+    };
+}</pre>
+
+<h2 id="规范">规范</h2>
+
+<p>Not part of any current specification draft document, but <a href="https://esdiscuss.org/topic/sept-23-2014-meeting-notes">has been</a> <a href="https://gist.github.com/lukewagner/2735af7eea411e18cf20">proposed</a> for a future ECMA-262 edition.</p>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.transfer")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Typed_arrays" title="en/JavaScript typed arrays">JavaScript typed arrays</a></li>
+</ul>