uTools-Manuals/docs/jQuery/jQuery.get.html

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<h1 class="entry-title">jQuery.get()</h1>
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						所属分类：<span class="category"><a href="/category/ajax/">Ajax</a> &gt; <a href="/category/ajax/shorthand-methods/">快捷方法</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/jQuery.get/" target="_blank">jQuery.get()</a></span>
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<article class="entry method" id="jQuery-get1"><h2 class="section-title">
<span class="name">jQuery.get( url [, data ] [, success(data, textStatus, jqXHR) ] [, dataType ] )</span><span class="returns">返回: <a href="/Types/#jqXHR">jqXHR</a></span>
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<p class="desc"><strong>描述: </strong>使用一个HTTP GET请求从服务器加载数据。</p>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>jQuery.get( url [, data ] [, success(data, textStatus, jqXHR) ] [, dataType ] )</h4>
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<div><strong>url</strong></div>
<div>类型: <a href="/Types/#String">String</a>
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<div>一个包含发送请求的URL字符串</div>
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<div><strong>data</strong></div>
<div>类型: <a href="/Types/#PlainObject,%20String">PlainObject, String</a>
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<div>发送给服务器的字符串或Key/value键值对。</div>
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<div><strong>success(data, textStatus, jqXHR)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>当请求成功后执行的回调函数。</div>
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<div><strong>dataType</strong></div>
<div>类型: <a href="/Types/#String">String</a>
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<div>从服务器返回的预期的数据类型。默认：智能猜测（xml, json, script, 或 html）。</div>
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<p>这是一个Ajax功能的缩写，这相当于:</p>
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<pre><div class="container"><div class="line"><code>$.ajax({</code></div></div><div class="container"><div class="line"><code>  url: url,</code></div></div><div class="container"><div class="line"><code>  data: data,</code></div></div><div class="container"><div class="line"><code>  success: success,</code></div></div><div class="container"><div class="line"><code>  dataType: dataType</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<p><code>success</code> 回调函数会传入返回的数据，是根据MIME类型的响应，它可能返回的数据类型包括XML根节点, 字符串, JavaScript 文件, 或者 JSON 对象。 同时还会传入描述响应状态的字符串。</p>
<p><strong>在jQuery 1.5</strong>，<code>success</code>回调函数还传递一个<a href="/jQuery.get/#jqxhr-object">“jqXHR”对象</a> （ <strong>在</strong> jQuery <strong>1.4中</strong> ，它传递的是<code>XMLHttpRequest</code>对象）。然而，由于JSONP形式和跨域的GET请求不使用<abbr title="XmlHttpRequest">XHR</abbr>，在这些情况下， <code>jqXHR</code>和<code>textStatus</code>参数传递给success（成功）回调是 undefined 。</p>
<p>大多数实现将指定一个成功的回调处理程序：</p>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">'ajax/test.html'</span>, <span class="keyword">function</span>(data) {</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">'.result'</span>).html(data);</code></div></div><div class="container"><div class="line"><code>  alert(<span class="string">'Load was performed.'</span>);</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<p>这个例子所请求到的HTML代码片段插在页面中。</p>
<h4 id="jqxhr-object">The jqXHR Object（jqXHR 对象）</h4>
<p><strong>从jQuery 1.5开始</strong>，所有jQuery的Ajax方法都返回一个<code>XMLHTTPRequest</code>对象的超集。这个通过<code>$.get()</code>方法返回的jQuery XHR对象，或“jqXHR，”实现了 Promise 接口，使它拥有 Promise 的所有属性，方法和行为（见<a href="/category/deferred-object/">Deferred object</a>获取更多信息）。<code>jqXHR.done()</code> (表示成功), <code>jqXHR.fail() (表示错误)</code>, 和 <code>jqXHR.always()</code> (表示完成, 无论是成功或错误) 方法接受一个函数参数，用来请求终止时被调用。关于这个函数接收参数的详细信息，请参阅 <a href="/jQuery.ajax/#jqXHR">jqXHR Object</a> 文档中的 $.ajax() 章节。</p>
<p>Promise 接口也允许jQuery的Ajax方法, 包括 <code>$.get()</code>, 在一个单独的请求中关联到 <code>.done()</code>, <code>.fail()</code>, 和 <code>.always()</code> 回调函数， 甚至允许你在请求已经结束后，指派回调函数。如果该请求已经完成，则回调函数会被立刻调用。</p>
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<pre><div class="container"><div class="line"><code><span class="comment">// Assign handlers immediately after making the request,</span></code></div></div><div class="container"><div class="line"><code>  <span class="comment">// and remember the jqxhr object for this request</span></code></div></div><div class="container"><div class="line"><code>  <span class="keyword">var</span> jqxhr = $.get(<span class="string">"example.php"</span>, <span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>    alert(<span class="string">"success"</span>);</code></div></div><div class="container"><div class="line"><code>  })</code></div></div><div class="container"><div class="line"><code>  .success(<span class="keyword">function</span>() { alert(<span class="string">"second success"</span>); })</code></div></div><div class="container"><div class="line"><code>  .error(<span class="keyword">function</span>() { alert(<span class="string">"error"</span>); })</code></div></div><div class="container"><div class="line"><code>  .complete(<span class="keyword">function</span>() { alert(<span class="string">"complete"</span>); });</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>  <span class="comment">// perform other work here ...</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>  <span class="comment">// Set another completion function for the request above</span></code></div></div><div class="container"><div class="line"><code>  jqxhr.complete(<span class="keyword">function</span>(){ alert(<span class="string">"second complete"</span>); });</code></div></div></pre>
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<h4>Deprecation Notice（推荐使用的注意事项：）</h4>
<p><code>jqXHR.success()</code>, <code>jqXHR.error()</code>, 和 <code>jqXHR.complete()</code> 回调方法 在jQuery 1.5中引进， <strong>在jQuery 1.8中不赞成使用，已经过时</strong>。他们最终将被取消（移除），你的代码应该为次做好准备，使用 <code>jqXHR.done()</code>, <code>jqXHR.fail()</code>, 和 <code>jqXHR.always()</code> 代替.</p>
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<h3>Additional Notes:（其他注意事项：）</h3>
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<li> 由于浏览器的安全限制，大多数“Ajax”的要求，均采用<a href="http://en.wikipedia.org/wiki/Same_origin_policy" title="维基百科上的同源策略">同一起源的政策</a> ;即无法从不同的域，子域或协议中正确接收数据。</li>
<li>如果一个jQuery.get（）请求返回一个错误代码，它会静静的失败，除非脚本调用全局的<a href="/ajaxError">.ajaxError（）</a>方法。在jQuery 1.5， 通过jQuery.get()返回的<code>jqXHR</code>对象的<code>.error()</code>方法也可用于错误处理。</li>
<li>Script和JSONP形式请求不受同源策略的限制。</li>
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<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
<h4>Example: <span class="desc">请求 test.php 页面, 但是忽略返回结果.</span>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">"test.php"</span>);</code></div></div></pre>
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<h4>Example: <span class="desc">请求 test.php 页面 并且发送url参数(虽然仍然忽视返回的结果)。</span>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">"test.php"</span>, { name: <span class="string">"John"</span>, time: <span class="string">"2pm"</span> } );</code></div></div></pre>
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<h4>Example: <span class="desc">传递数组形式data参数给服务器 (虽然仍然忽视返回的结果).</span>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">"test.php"</span>, { <span class="string">'choices[]'</span>: [<span class="string">"Jon"</span>, <span class="string">"Susan"</span>]} );</code></div></div></pre>
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<h4>Example: <span class="desc">Alert 从 test.php请求的数据结果 (HTML 或者 XML,取决于返回的结果).</span>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">"test.php"</span>, <span class="keyword">function</span>(data){</code></div></div><div class="container"><div class="line"><code>alert(<span class="string">"Data Loaded: "</span> + data);</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<div class="entry-example" id="example-4">
<h4>Example: <span class="desc"> Alert 从 test.cgi请求并且发送url参数的数据结果 (HTML 或者 XML,取决于返回的结果).</span>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">"test.cgi"</span>, { name: <span class="string">"John"</span>, time: <span class="string">"2pm"</span> },</code></div></div><div class="container"><div class="line"><code>   <span class="keyword">function</span>(data){</code></div></div><div class="container"><div class="line"><code>     alert(<span class="string">"Data Loaded: "</span> + data);</code></div></div><div class="container"><div class="line"><code>   });</code></div></div></pre>
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<div class="entry-example" id="example-5">
<h4>Example: <span class="desc">  获取test.php的页面已返回的JSON格式的内容  (&lt;?php echo json_encode(array("name"=&gt;"John","time"=&gt;"2pm")); ?&gt;), 并且加到页面中.</span>
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<pre><div class="container"><div class="line"><code>$.get(<span class="string">"test.php"</span>,</code></div></div><div class="container"><div class="line"><code>   <span class="keyword">function</span>(data){</code></div></div><div class="container"><div class="line"><code>     $(<span class="string">'body'</span>).append( <span class="string">"Name: "</span> + data.name ) <span class="comment">// John</span></code></div></div><div class="container"><div class="line"><code>              .append( <span class="string">"Time: "</span> + data.time ); <span class="comment">//  2pm</span></code></div></div><div class="container"><div class="line"><code>   }, <span class="string">"json"</span>);</code></div></div></pre>
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