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119 lines
6.4 KiB
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119 lines
6.4 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<h2 id="Summary" name="Summary">概述</h2>
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<p><code><strong>toPrecision()</strong></code> 方法以指定的精度返回该数值对象的字符串表示。</p>
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<h2 id="Syntax" name="Syntax">语法</h2>
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<pre><code class="language-javascript"><code><em>numObj</em>.toPrecision(<em>precision</em>)</code></code></pre>
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<h3 id="Parameter" name="Parameter">参数</h3>
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<dl>
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<dt>precision</dt>
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<dd>可选。一个用来指定有效数个数的整数。</dd>
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</dl>
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<h3 id="Returns" name="Returns">返回值</h3>
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<p>以定点表示法或指数表示法表示的一个数值对象的字符串表示,四舍五入到 <code>precision</code> 参数指定的显示数字位数。查看 <a href="Reference/Global_Objects/Number/toFixed" title="toFixed() 方法使用定点表示法来格式化一个数。"><code>Number.prototype.toFixed()</code></a> 方法关于四舍五入的讨论,同样应用于 <code>toPrecision</code> 方法。</p>
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<p>如果忽略 <code>precision</code> 参数,则该方法表现类似于 <a href="Reference/Global_Objects/Number/toString" title="toString() 方法返回指定 Number 对象的字符串表示形式。"><code>Number.prototype.toString()</code></a>。如果该参数是一个非整数值,将会向下舍入到最接近的整数。</p>
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<h3 id="异常">异常</h3>
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<dl>
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<dt><a href="Reference/Global_Objects/RangeError" title="RangeError对象标明一个错误,当一个值不在其所允许的范围或者集合中。"><code>RangeError</code></a></dt>
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<dd>如果 <em>precison</em> 参数不在 1 和 100 (包括)之间,将会抛出一个 <code>RangeError</code> 。执行环境也可以支持更大或更小的范围。ECMA-262 只需要最多 21 位显示数字。</dd>
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</dl>
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<h2 id="Example" name="Example">示例</h2>
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<pre><code class="language-javascript">var numObj = 5.123456;
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console.log("numObj.toPrecision() is " + numObj.toPrecision()); //输出 5.123456
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console.log("numObj.toPrecision(5) is " + numObj.toPrecision(5)); //输出 5.1235
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console.log("numObj.toPrecision(2) is " + numObj.toPrecision(2)); //输出 5.1
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console.log("numObj.toPrecision(1) is " + numObj.toPrecision(1)); //输出 5
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// 注意:在某些情况下会以指数表示法返回
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console.log((1234.5).toPrecision(2)); // "1.2e+3"
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</code></pre>
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<h2 id="规范">规范</h2>
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<table class="standard-table">
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<tbody>
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<tr>
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<th scope="col">规范</th>
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<th scope="col">规范状态</th>
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<th scope="col">注解</th>
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</tr>
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<tr>
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<td>ECMAScript 3rd Edition. Implemented in JavaScript 1.5</td>
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<td>Standard</td>
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<td>Initial definition.</td>
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</tr>
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<tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/5.1/#sec-15.7.4.7" hreflang="en" lang="en" rel="noopener">ECMAScript 5.1 (ECMA-262)<br/><small lang="zh-CN">Number.prototype.toPrecision</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td> </td>
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</tr>
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<tr>
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<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-number.prototype.toprecision" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Number.prototype.toPrecision</small></a></td>
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<td><span class="spec-Standard">Standard</span></td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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<h2 id="浏览器兼容性">浏览器兼容性</h2>
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<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
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This compatibility table still uses the old format,
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because we haven't yet converted the data it contains.
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<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
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<div class="htab">
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<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
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<ul>
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<li class="selected"><a>Desktop</a></li>
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<li><a>Mobile</a></li>
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</ul>
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</div><p></p>
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<div id="compat-desktop">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Chrome</th>
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<th>Firefox (Gecko)</th>
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<th>Internet Explorer</th>
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<th>Opera</th>
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<th>Safari</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<div id="compat-mobile">
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<table class="compat-table">
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<tbody>
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<tr>
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<th>Feature</th>
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<th>Android</th>
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<th>Chrome for Android</th>
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<th>Firefox Mobile (Gecko)</th>
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<th>IE Mobile</th>
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<th>Opera Mobile</th>
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<th>Safari Mobile</th>
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</tr>
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<tr>
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<td>Basic support</td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<h2 id="See_Also" name="See_Also">相关链接</h2>
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<ul>
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<li><a href="Reference/Global_Objects/Number/toFixed" title="toFixed() 方法使用定点表示法来格式化一个数。"><code>Number.prototype.toFixed()</code></a></li>
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<li><a href="Reference/Global_Objects/Number/toExponential" title="toExponential() 方法以指数表示法返回该数值字符串表示形式。"><code>Number.prototype.toExponential()</code></a></li>
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<li><a href="Reference/Global_Objects/Number/toString" title="toString() 方法返回指定 Number 对象的字符串表示形式。"><code>Number.prototype.toString()</code></a></li>
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</ul>
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</article> |