CSS/JavaScript默认开始淡出，然后淡入 [英] css/javascript start faded out by default, then fade in

问题描述

我正在尝试创建一个按钮，该按钮会使绿色的选中图像淡入，然后再次淡出.多数情况下都可以，但是如何在页面加载时使支票从淡出的位置开始呢?

I'm trying to make a button that causes a green check image to fade in then fade out again. It mostly works, but how do I make the check start out in the faded out position when the page loads?

我尝试将 opacity:0; 放入其CSS中，假定fadeIn函数会更改不透明度，但此后它根本不会显示.

I tried to put opacity: 0; in its css, assuming that the fadeIn function changes the opacity, but then it doesn't show up at all.

function green_check(check) { //fade in half a sec, hold 2 sec, fade out in 3 sec
  $(check).fadeIn(500, function() {
    $(this).delay(2000).fadeOut(3000);
  });
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button type="button" onclick="green_check(getElementById('check'));">Show Check</button>

<img class='five_sec_check' width="50" height="50" id="check" src='http://cliparts.co/cliparts/qcB/Bex/qcBBexbc5.png' />

是否有其他我可以在调用前在CSS中设置的fadeIn/fadeOut使用的透明度属性?还是可以防止css中的不透明性覆盖fadeIn函数?

Is there some other transparency property that fadeIn/fadeOut uses that I can set in the css before those are called? Or maybe prevent the opacity in the css from overriding the fadeIn function?

谢谢

推荐答案

我将在CSS中使用display:none来隐藏页面加载:

I'd use display:none in css to hide on page load:

#check {
  display:none;
}

function green_check(check){ //fade in half a sec, hold 2 sec, fade out in 3 sec
    $(check).fadeIn(500, function () {
        $(this).delay(2000).fadeOut(3000);
    });
}

#check {
  display:none;
  width:16px;
  height:16px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button type="button" onclick="green_check(getElementById('check'));">Show Check</button>

<img class='five_sec_check' id="check" src='http://neil.computer/s/check.png'/>

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