initial commit

1 files changed, 164 insertions, 0 deletions

diff --git a/files/zh-cn/web/javascript/reference/global_objects/math/ceil/index.html b/files/zh-cn/web/javascript/reference/global_objects/math/ceil/index.html
new file mode 100644
index 0000000000..9b316f075a
--- /dev/null
+++ b/files/zh-cn/web/javascript/reference/global_objects/math/ceil/index.html
@@ -0,0 +1,164 @@
+---
+title: Math.ceil()
+slug: Web/JavaScript/Reference/Global_Objects/Math/ceil
+tags:
+  - JavaScript
+  - Math
+  - 参考
+  - 数学
+  - 方法
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/ceil
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Math.ceil()</code></strong> 函数返回大于或等于一个给定数字的最小整数。</p>
+
+<p><strong>Note: </strong><code>Math.ceil({{jsxref("null")}})</code> returns integer 0 and does not give a {{jsxref("NaN")}} error.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/math-ceil.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code>Math.ceil(<var>x</var>)</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>一个数值。</dd>
+ <dt>
+ <h3 id="返回值">返回值</h3>
+
+ <p>大于或等于给定数字的最小整数。</p>
+ </dt>
+</dl>
+
+<h2 id="描述">描述</h2>
+
+<p>由于 <code>ceil</code> 是 <code>Math</code> 的静态方法，所以应该像这样使用：<code>Math.ceil()</code>，而不是作为你创建的 <code>Math</code> 实例的方法。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_Math.ceil">使用 <code>Math.ceil</code></h3>
+
+<p>下例展示了 <code>Math.ceil()</code> 的使用：</p>
+
+<pre class="brush: js">// Closure
+(function() {
+  /**
+   * Decimal adjustment of a number.
+   *
+   * @param {String}  type  The type of adjustment.
+   * @param {Number}  value The number.
+   * @param {Integer} exp   The exponent (the 10 logarithm of the adjustment base).
+   * @returns {Number} The adjusted value.
+   */
+  function decimalAdjust(type, value, exp) {
+    // If the exp is undefined or zero...
+    if (typeof exp === 'undefined' || +exp === 0) {
+      return Math[type](value);
+    }
+    value = +value;
+    exp = +exp;
+    // If the value is not a number or the exp is not an integer...
+    if (isNaN(value) || !(typeof exp === 'number' &amp;&amp; exp % 1 === 0)) {
+      return NaN;
+    }
+    // Shift
+    value = value.toString().split('e');
+    value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)));
+    // Shift back
+    value = value.toString().split('e');
+    return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp));
+  }
+
+  // Decimal round
+  if (!Math.round10) {
+    Math.round10 = function(value, exp) {
+      return decimalAdjust('round', value, exp);
+    };
+  }
+  // Decimal floor
+  if (!Math.floor10) {
+    Math.floor10 = function(value, exp) {
+      return decimalAdjust('floor', value, exp);
+    };
+  }
+  // Decimal ceil
+  if (!Math.ceil10) {
+    Math.ceil10 = function(value, exp) {
+      return decimalAdjust('ceil', value, exp);
+    };
+  }
+})();
+
+// Round
+Math.round10(55.55, -1);   // 55.6
+Math.round10(55.549, -1);  // 55.5
+Math.round10(55, 1);       // 60
+Math.round10(54.9, 1);     // 50
+Math.round10(-55.55, -1);  // -55.5
+Math.round10(-55.551, -1); // -55.6
+Math.round10(-55, 1);      // -50
+Math.round10(-55.1, 1);    // -60
+// Floor
+Math.floor10(55.59, -1);   // 55.5
+Math.floor10(59, 1);       // 50
+Math.floor10(-55.51, -1);  // -55.6
+Math.floor10(-51, 1);      // -60
+// Ceil
+Math.ceil10(55.51, -1);    // 55.6
+Math.ceil10(51, 1);        // 60
+Math.ceil10(-55.59, -1);   // -55.5
+Math.ceil10(-59, 1);       // -50
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范版本</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">注解</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.8.2.6', 'Math.ceil')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.ceil', 'Math.ceil')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.ceil', 'Math.ceil')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Math.ceil")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("Math.abs()")}}</li>
+ <li>{{jsxref("Math.floor()")}}</li>
+ <li>{{jsxref("Math.round()")}}</li>
+ <li>{{jsxref("Math.sign()")}}</li>
+ <li>{{jsxref("Math.trunc()")}}</li>
+</ul>