study/uTools-Manuals
1
0
Fork 0
mirror of https://github.com/fofolee/uTools-Manuals.git synced 2026-02-28 01:58:28 +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/isExtensible.html
View File

@@ -1,11 +1,11 @@
<article id="wikiArticle">
<div>handler.isExtensible()用于拦截对对象的Object.isExtensible()。</div>
<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, {
isExtensible: function(target) {
}
});
</pre>
</code></pre>
<h3 id="参数">参数</h3>
<p>下列参数将会被传递给 <code>isExtensible</code>方法。 this 绑定在 handler 对象上。</p>
<dl>
@@ -29,7 +29,7 @@
</ul>
<h2 id="示例">示例</h2>
<p>以下代码演示<a href="Reference/Global_Objects/Object/isExtensible" title="Object.isExtensible() 方法判断一个对象是否是可扩展的（是否可以在它上面添加新的属性）。"><code>Object.isExtensible()</code></a>.</p>
<pre class="brush: js">var p = new Proxy({}, {
<pre><code class="language-javascript">var p = new Proxy({}, {
isExtensible: function(target) {
console.log('called');
return true;//也可以return 1;等表示为true的值
@@ -38,16 +38,16 @@
console.log(Object.isExtensible(p)); // "called"
// true
</pre>
</code></pre>
<p>以下代码演示违反约束的情况。</p>
<pre class="brush: js">var p = new Proxy({}, {
<pre><code class="language-javascript">var p = new Proxy({}, {
isExtensible: function(target) {
return false;//return 0;return NaN等都会报错
}
});
Object.isExtensible(p); // TypeError is thrown
</pre>
</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>