blob: 6ed5b252da0e2d4bac251113bb94cbbe2b98cb12 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
---
title: DataView.prototype.getUint16()
slug: Web/JavaScript/Reference/Global_Objects/DataView/getUint16
tags:
- 类型化
- 类型化数组
translation_of: Web/JavaScript/Reference/Global_Objects/DataView/getUint16
---
<div>{{JSRef}}</div>
<p><strong><code>getUint16()</code></strong><code>方法</code><code>从</code><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView" title="DataView 视图提供了一种用于向 ArrayBuffer 读写数据的底层接口。"><code>DataView</code></a>相对于起始位置偏移 n 个字节处开始，获取一个16-bit数(无符号短整型，2个字节).</p>
<div>{{EmbedInteractiveExample("pages/js/dataview-getuint16.html")}}</div>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><var>dataview</var>.getUint16(byteOffset [, littleEndian])</pre>
<h3 id="参数">参数</h3>
<dl>
<dt>byteOffset</dt>
<dd>偏移量, 单位为字节, 从头开始计算.</dd>
<dt>littleEndian</dt>
<dd>{{optional_inline}} Indicates whether the 16-bit int is stored in {{Glossary("Endianness", "little- or big-endian")}} format. If false or undefined, a big-endian value is read.</dd>
</dl>
<h3 id="返回">返回</h3>
<dl>
<dd>一个无符号短整型16位数.</dd>
</dl>
<h3 id="抛出错误">抛出错误</h3>
<dl>
<dt>{{jsxref("RangeError")}}</dt>
<dd>如果byteOffset超出了视图能储存的值，就会抛出错误.</dd>
</dl>
<h2 id="描述">描述</h2>
<dl>
<dd>没有对齐约束; 多字节值可以从任何偏移量获取.</dd>
</dl>
<h2 id="例子">例子</h2>
<pre class="brush:js">var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getUint16(1); // 0
</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('Typed Array')}}</td>
<td>{{Spec2('Typed Array')}}</td>
<td>Superseded by ECMAScript 6.</td>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-dataview.prototype.getuint16', 'DataView.prototype.getUint16')}}</td>
<td>{{Spec2('ES6')}}</td>
<td>Initial definition in an ECMA standard.</td>
</tr>
<tr>
<td>{{SpecName('ESDraft', '#sec-dataview.prototype.getuint16', 'DataView.prototype.getUint16')}}</td>
<td>{{Spec2('ESDraft')}}</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="浏览器支持">浏览器支持</h2>
<p>{{Compat("javascript.builtins.DataView.getUint16")}}</p>
<h2 id="另见">另见</h2>
<ul>
<li>{{jsxref("DataView")}}</li>
<li>{{jsxref("ArrayBuffer")}}</li>
</ul>
|
