study/uTools-Manuals
1
0
Fork 0
mirror of https://github.com/fofolee/uTools-Manuals.git synced 2026-02-28 10:03:04 +08:00
Code Issues Packages Projects Releases Wiki Activity

语法高亮，滚动条美化，设置页面调整

Browse Source
This commit is contained in:
fofolee
2019-04-19 02:41:09 +08:00
parent 1e8f76c000
commit 359d29ee0b
1590 changed files with 12328 additions and 11441 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
docs/javascript/Reference/Global_Objects/Proxy/handler/preventExtensions.html
View File

@@ -4,11 +4,11 @@
<p><a href="Reference/Global_Objects/Object/preventExtensions" title="Object.preventExtensions()方法让一个对象变的不可扩展，也就是永远不能再添加新的属性。"><code>Object.preventExtensions()</code></a></p>
<p>的拦截</p>
<h2 id="语法">语法</h2>
<pre class="brush: js">var p = new Proxy(target, {
<pre><code class="language-javascript">var p = new Proxy(target, {
preventExtensions: function(target) {
}
});
</pre>
</code></pre>
<h3 id="参数">参数</h3>
<p>以下参数传递给 <code>preventExtensions</code> 方法. 它会绑定到这个handler.</p>
<dl>
@@ -32,7 +32,7 @@
</ul>
<h2 id="示例">示例</h2>
<p>以下代码演示了如何拦截<a href="Reference/Global_Objects/Object/preventExtensions" title="Object.preventExtensions()方法让一个对象变的不可扩展，也就是永远不能再添加新的属性。"><code>Object.preventExtensions()</code></a>。</p>
<pre class="brush: js">var p = new Proxy({}, {
<pre><code class="language-javascript">var p = new Proxy({}, {
preventExtensions: function(target) {
console.log('called');
Object.preventExtensions(target);
@@ -42,16 +42,16 @@
console.log(Object.preventExtensions(p)); // "called"
// false
</pre>
</code></pre>
<p>以下代码违反了约束.</p>
<pre class="brush: js">var p = new Proxy({}, {
<pre><code class="language-javascript">var p = new Proxy({}, {
preventExtensions: function(target) {
return true;
}
});
Object.preventExtensions(p); // 抛出类型错误
</pre>
</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>