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+---
+title: 'TypeError: setting getter-only property "x"'
+slug: Web/JavaScript/Reference/Errors/Getter_only
+tags:
+  - JavaScript
+  - 严格模式
+  - 类型错误
+  - 错误提示
+translation_of: Web/JavaScript/Reference/Errors/Getter_only
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="错误提示">错误提示</h2>
+
+<pre class="syntaxbox">TypeError: setting getter-only property "x" (Firefox)
+TypeError: Cannot set property "prop" of #&lt;Object&gt; which has only a getter (Chrome)
+</pre>
+
+<h2 id="错误类型">错误类型</h2>
+
+<p>仅在<a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a>下报 {{jsxref("TypeError")}} 错误。</p>
+
+<h2 id="哪里出错了？">哪里出错了？</h2>
+
+<p>该错误提示出现于试图给一个仅仅设置了 <a href="/en-US/docs/Web/JavaScript/Reference/Functions/get">getter</a> 特性的属性赋新值的时候。在非严格模式下会被静默忽略，而在<a href="/en-US/docs/Web/JavaScript/Reference/Strict_mode">严格模式</a>下会报 {{jsxref("TypeError")}} 错误。</p>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的例子展示了如何为一个属性设置 getter 特性。由于没有设置 <a href="/en-US/docs/Web/JavaScript/Reference/Functions/set">setter</a> 特性，所以在试图将 temperature 属性值设置为 30 的时候会报 TypeError 的错误。相关细节信息可以参考 {{jsxref("Object.defineProperty()")}} 页面。</p>
+
+<pre class="brush: js example-bad">"use strict";
+
+function Archiver() {
+  var temperature = null;
+  Object.defineProperty(this, 'temperature', {
+    get: function() {
+      console.log('get!');
+      return temperature;
+    }
+  });
+}
+
+var arc = new Archiver();
+arc.temperature; // 'get!'
+
+arc.temperature = 30;
+// TypeError: setting getter-only property "temperature"</pre>
+
+<p>至于修复问题的方法，可以将第 16 行的代码移除，因为它试图为 temperature 属性赋值，或者是为它添加一个 <a href="/en-US/docs/Web/JavaScript/Reference/Functions/set">setter</a> 特性，就像下面这样：</p>
+
+<pre class="brush: js example-good highlight[12]">"use strict";
+
+function Archiver() {
+  var temperature = null;
+  var archive = [];
+
+  Object.defineProperty(this, 'temperature', {
+    get: function() {
+      console.log('get!');
+      return temperature;
+    },
+    set: function(value) {
+      temperature = value;
+      archive.push({ val: temperature });
+    }
+  });
+
+  this.getArchive = function() { return archive; };
+}
+
+var arc = new Archiver();
+arc.temperature; // 'get!'
+arc.temperature = 11;
+arc.temperature = 13;
+arc.getArchive(); // [{ val: 11 }, { val: 13 }]</pre>
+
+<h2 id="相关内容">相关内容</h2>
+
+<ul>
+ <li>{{jsxref("Object.defineProperty()")}}</li>
+ <li>{{jsxref("Object.defineProperties()")}}</li>
+</ul>