测试浏览器是否支持样式 [英] test browser supports the style or not

问题描述

我可以执行以下操作来检查浏览器是否不支持列计数css3属性，然后使用我自己的代码：

I can do the following to check if the browser doesn't support column-count css3 property then use my own code:

if (!('WebkitColumnCount' in document.body.style
        || 'MozColumnCount' in document.body.style
        || 'OColumnCount' in document.body.style
        || 'MsColumnCount' in document.body.style
        || 'columnCount' in document.body.style))
    {//my own code here}

但是如何检查背景图像动画支持？

But how can I check that background-image animation support?

这种类型的变化图像使用css3的源仅适用于Chrome浏览器。

This type of changing image source with css3 only works on chrome browsers.

0%{background-image: url(image-1);}
50%{background-image: url(image-2);}
100%{background-image: url(image-3);}

所以，我想知道是否有任何技术我们可以测试浏览器是否支持它？

So, I wanted to know is there any technique that we can test that it is supported by the browser or not?

更新

我刚试过这个甚至没有检查@keyframes样式支持的代码：

I just tried like this code which is even not checking @keyframes style support:

if (('@keyframes' in document.body.style || '@-webkit-keyframes' in document.body.style))
{
   //if(!('from' in @keyframes || 'from' in @webkit-keyframes)){
   //code in here
   alert('test');
   //}
}

所以我甚至不能测试@keyframes是否支持浏览器？

So even can I not test that @keyframes supported by browser or not?

解决方案：

我从 mdn <找到了/ a>

I've found from mdn

var animation = false,
    animationstring = 'animation',
    keyframeprefix = '',
    domPrefixes = 'Webkit Moz O ms Khtml'.split(' '),
    pfx  = '';

if( elm.style.animationName !== undefined ) { animation = true; }    

if( animation === false ) {
  for( var i = 0; i < domPrefixes.length; i++ ) {
    if( elm.style[ domPrefixes[i] + 'AnimationName' ] !== undefined ) {
      pfx = domPrefixes[ i ];
      animationstring = pfx + 'Animation';
      keyframeprefix = '-' + pfx.toLowerCase() + '-';
      animation = true;
      break;
    }
  }
}

推荐答案

除了在评论中提到 现代化者 之外，我们还可以首先添加 供应商前缀 作为背景动画，以获得更多浏览器覆盖率。喜欢：

As well as the mention to modernizer in the comments - we could first add in the vendor prefixes for the background animations to get more browser coverage. like :

#animationdivTest { 
   animation: animatedBackground 20s linear infinite;
   -ms-animation: animatedBackground 20s linear infinite;
   -moz-animation: animatedBackground 20s linear infinite;
   -webkit-animation: animatedBackground 20s linear infinite;
}

我猜你正在做什么动画

在javascript中对此进行直接检查可能

A blunt check for this in javascript might be

/* check a doc.fragment div or test div on page */
var el = document.getElementById('animationdivTest');
/* create a function here to test for ALL the vendor prefixes 
( this is where modernizer comes in v handy )

 one example - */
if( el.style['-webkit-animation'] !== undefined ) {
   document.getElementsByTagName("html")[0].className +=' cssanimation'; 
}

我们的Css可以定制：

Our Css can then be tailored :

.cssanimation #animationdiv { 
       animation: animatedBackground ...

---

我们可以在这里进行实时游戏 - http://jsbin.com/yamepucu/1/edit

不确定有多少可以帮助你们已经知道的东西，希望某些部分确实。

Not sure how much that helps vrs what you already know , hope some part did.

HTML

  <div id="animationdivTest">Testing...</div>
  <div id="animationdiv"></div>

CSS

@-webkit-keyframes bgAnimation {
  0% {
    background-image: url('http://www.new4.co.uk/flip/flip-3.gif');
  }
  40% {
    background-image: url('http://www.new4.co.uk/flip/flip-2.gif');
  }
  70% {
    background-image: url('http://www.new4.co.uk/flip/flip-1.gif');
  }
  100% {
    background-image: url('http://www.new4.co.uk/flip/flip-0.gif');
  }

}

#animationdivTest, .cssbgAnimation #animationdiv {

  width: 90px;
  height: 240px;
  -webkit-animation-name: bgAnimation;
  -webkit-animation-duration: 1s;
  -webkit-animation-iteration-count: infinite;

}

#animationdiv:after { content:"Sorry not supported"; }  
.cssbgAnimation #animationdiv:after { content:""; }
.cssbgAnimation #animationdivTest { position:absolute; left:-999px; top:-9999px; }

示例JS 在函数循环中添加以检查这次是其他供应商的前缀。

var el = document.getElementById('animationdivTest');
function hasBgAnimSupport() {
  var does =false, 
  animVendorprefixes = ['animation','-ms-animation','-moz-animation','-webkit-animation'];

  for(i=0, len = animVendorprefixes.length; i<len; ++i) {
    if( el.style[animVendorprefixes[i]] !== undefined ) { 
      if( el.style['background-image'] !== undefined ) {
        does=true; break;
      }
    }
  }
  return does;
 } 


if(hasBgAnimSupport() ) { 
   document.getElementsByTagName("html")[0].className +=' cssbgAnimation';
}

AFAIK - 这是我们可以检查的最接近和未来的证明方式

AFAIK - this is the closest and future proof way we can check for this

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