本文介绍了如何通过JavaScript实现点击按钮让iframe全屏显示。主要涉及两个步骤：一是调用全屏API使窗口全屏，二是调整iframe样式使其填充整个屏幕。提供的JS代码示例向iframe添加了一个class，该class包含全屏所需的样式。虽然由于安全限制，在JSFiddle上无法演示，但在实际应用中应当能正常工作。
I would to make the iFrame to appear on fullscreen with a button click using JavaScript.
解决方案
You will have to do two things: make the window fullscreen, and then the to fill up the whole size.
You can make it go fullscreen with JS such as in this SO answer.
Then, to make it full size, just add a few styles, like below. What this JS script does is add a class with those styles to the .
JS
document.getElementsByTagName("iframe")[0].className = "fullScreen";
CSS
body, html {
height: 100%;
margin: 0;
}
.fullScreen {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
*partially working because JSFiddle doesn't allow the fullscreen method because it deems it unsafe. But it should work for you.
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