javascript - 获取变量的值 or <object></a></h1> </div> <div class="d-flex fw-wrap pb8 mb16 bb bc-black-075" style="font-size:14px;margin-top:10px;"> <div class="flex--item ws-nowrap mr16 mb8" title="2022-04-17 15:46:40Z" > <span class="fc-light mr2">翻译自：<a href="https://stackoverflow.com/questions/42722476" style="margin-right:20px;text-decoration:underline;" rel="nofollow">https://stackoverflow.com/questions/42722476</a></span> <time itemprop="dateCreated" datetime="2017-03-10T15:51:43.217">2017-03-10T15:51:43.217</time> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 6 times"> <span class="fc-light mr2"></span> 1023 次 </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> <div class="question" data-questionid="4" data-position-on-page="0" data-score="763" id="question"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="4"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-peeufs8c"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button> <div id="--stacks-s-tooltip-peeufs8c" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question shows research effort; it is useful and clear<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value=""> 2 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-04106eqn"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button><div id="--stacks-s-tooltip-04106eqn" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question does not show any research effort; it is unclear or not useful<div class="s-popover--arrow"></div></div> <div id="--stacks-s-tooltip-tgvwendx" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Bookmark this question.<div class="s-popover--arrow"></div></div> <a class="js-post-issue flex--item s-btn s-btnunset c-pointer py6 mx-auto" data-shortcut="T" data-ks-title="timeline" data-controller="s-tooltip" data-s-tooltip-placement="right" aria-label="Timeline" aria-describedby="--stacks-s-tooltip-abwmy15k"><svg aria-hidden="true" class="mln2 mr0 svg-icon iconHistory" width="19" height="18" viewBox="0 0 19 18"><path d="M3 9a8 8 0 1 1 3.73 6.77L8.2 14.3A6 6 0 1 0 5 9l3.01-.01-4 4-4-4h3L3 9Zm7-4h1.01L11 9.36l3.22 2.1-.6.93L10 10V5Z"></path></svg></a><div id="--stacks-s-tooltip-abwmy15k" class="s-popover s-popover__tooltip pe-none" aria-hidden="true" role="tooltip">Show activity on this post.<div class="s-popover--arrow"></div></div> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>In my global html template, I have embedded an <code>iframe</code>, which can live-preview <code>{{src}}</code> (eg, <code>src</code> could be <code>public/tmp/bDCZ5rynnpLaYNEuAAAj/index.html</code>).</p>

<pre><code><iframe id="myiframe" ng-src="{{src}}"></iframe>
</code></pre>

<p>The <code>index.html</code> is a file written by my server; I have control of the code and I can modify it. <code>index.html</code> contains JavaScript code, it is designed such that it always has an internal variable <code>$output</code>.</p>

<p>My question is, how to get the value of <code>$output</code> out of the <code>iframe</code> and let the global html page know the value.</p>

<p>Does anyone know how to accomplish this?</p>

<p><strong>Edit 1:</strong> I am also open to solutions where <code>index.html</code> could send the value to the server or create a file with the value, as long as the global template could get it later. Additionally, as I mention in comments, the purpose of <code>iframe</code> is to live-preview a folder of files, there are <a href="https://stackoverflow.com/questions/42569214/make-a-web-page-with-a-folder-of-external-files">other ways</a> to do so (eg, using <code><object></code>), does anyone know which way could let me get an internal value out?</p>

<p><strong>Edit 2:</strong> I have made a <a href="https://plnkr.co/edit/5bByYqwrrzkslLK6Fnc2?p=preview" rel="nofollow noreferrer">plunker with iframe</a> and a <a href="https://plnkr.co/edit/uSik7MYblkTdTofu2v1B?p=preview" rel="nofollow noreferrer">plunker with object</a>. <code>$output</code> is defined by <code><script>var $output="Default"</script></code> in <a href="https://www.matrixlead.com/tmp/indexOutput.html" rel="nofollow noreferrer">indexOutput.html</a>. My goal is to get this value out.</p>

<p><strong>Edit 3:</strong> I just realised that <code>window.parent._resetter</code> that @Roy suggested in his answer works. But one thing is, the <code>_resetter</code> function must be defined in the script of the html page. Does anyone know how to <strong>pass this value to my controller</strong>? Here is <a href="https://plnkr.co/edit/Ak4mswbHeqKQZHl0zrUl?p=preview" rel="nofollow noreferrer">a plunker</a>, and <a href="https://plnkr.co/edit/Sp6uiPmLQIVQj3IWoJSa?p=preview" rel="nofollow noreferrer">a plunker with $window</a>.</p>
 </div> <div class="mt24 mb12"> <div class="post-taglist d-flex gs4 gsy fd-column"> <div class="d-flex ps-relative fw-wrap"> <a href="/tags/javascript" class="post-tag js-gps-track" title="show questions tagged 'javascript'" rel="tag">javascript</a><a href="/tags/angularjs" class="post-tag js-gps-track" title="show questions tagged 'angularjs'" rel="tag">angularjs</a><a href="/tags/node.js" class="post-tag js-gps-track" title="show questions tagged 'node.js'" rel="tag">node.js</a><a href="/tags/iframe" class="post-tag js-gps-track" title="show questions tagged 'iframe'" rel="tag">iframe</a><a href="/tags/html-object" class="post-tag js-gps-track" title="show questions tagged 'html-object'" rel="tag">html-object</a> </div> </div> </div> </div> <span class="d-none" itemprop="commentCount">4</span> </div> </div> <div class="js-zone-container zone-container-responsive"> <div id="dfp-isb" class="everyonelovesstackoverflow everyonelovesinline-sidebar mx-auto" style="min-height: auto; height: auto; display: none;"></div> <div class="js-report-ad-button-container mx-auto" style="width: 300px"></div> </div> <div id="answers"> <a name="tab-top"></a> <div id="answers-header"> <div class="answers-subheader d-flex ai-center mb8"> <div class="flex--item fl1"> <h2 class="mb0" data-answercount=""> 1 回答 <span style="display:none;" itemprop="answerCount">1</span> </h2> </div> </div> </div> <a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button><div id="--stacks-s-tooltip-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value="3"> 3 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-gn8ppsfv"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p><code>window.parent.someFunction</code>您可以通过从 iframe 调用来在 root 和 iframe 之间进行通信。您必须在根目录中创建一个函数来接收参数并重新设置它自己。 <br></p> <pre><code>function _resetter(param){ var paramRoot = param; } </code></pre> <p><br> 并从传递参数的 iframe 调用此函数<code>ouput</code> <br></p> <pre><code>window.parent._resetter(param); </code></pre> <p>见<a href="https://stackoverflow.com/a/2161402/7349445">https://stackoverflow.com/a/2161402/7349445</a></p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2017-03-10T15:57:36.550 回答</div> </div> </div> </div> </div></div> </div> <div id="sidebar" class="show-votes" role="complementary" aria-label="sidebar"> <div class="module sidebar-related"> <h4 id="h-related">Related</h4> <div class="related js-gps-related-questions" data-tracker="rq=1"> <div 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