js and css3 to achieve rotation effect-JS Tutorial-php.cn

js and css3 to achieve rotation effect

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Release： 2018-06-25 15:52:22

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This article mainly introduces the method of achieving rotation effect in js css3. It has a certain reference value, let’s take a look at it together

My previous article achieved the effect of using css3 to create rotation. Now, I use another method to achieve it. That is to use js combined with css3 The method is implemented. Now I will show you the effect by showing the picture.

Now I will put my css code first, the code is very simple:

.one{
width:200px;
height: 200px;
border:1px solid #adadad;
transition:all 0.1s;
border-radius:50%;
background:url(images/1.jpg) no-repeat center center;
background-size:cover;
margin:50px auto;
}

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Everyone can understand the above code, so I won’t introduce it. What I focus on is the code part of js.

window.onload=function(){
 var p=document.getElementsByClassName("one")[0];
 console.log(p);
 setCss3(p,{transform:"rotate(10deg)","transform-origin":"50% 50%"})
 var angel=0;
 setInterval(function(){
 angel+=8;
 setCss3(p,{transform:"rotate("+angel+"deg)","transform-origin":"0 0"})
 },30)
 function setCss3(obj,objAttr){
 //循环属性对象
 for(var i in objAttr){
 var newi=i;
 //判断是否存在transform-origin这样格式的属性
 if(newi.indexOf("-")>0){
 var num=newi.indexOf("-");
 newi=newi.replace(newi.substr(num,2),newi.substr(num+1,1).toUpperCase());
 }
 //考虑到css3的兼容性问题,所以这些属性都必须加前缀才行
 obj.style[newi]=objAttr[i];
 newi=newi.replace(newi.charAt(0),newi.charAt(0).toUpperCase());
 obj.style[newi]=objAttr[i];
 obj.style["webkit"+newi]=objAttr[i];
 obj.style["moz"+newi]=objAttr[i];
 obj.style["o"+newi]=objAttr[i];
 obj.style["ms"+newi]=objAttr[i];
 }
 }
}

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I will talk about the relative difficulties here:

if(newi.indexOf("-")>0){
  var num=newi.indexOf("-");
  newi=newi.replace(newi.substr(num,2),newi.substr(num,2).toUpperCase());
 }

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newi=newi.replace(newi.substr(num,2),newi.substr(num,2).toUpperCase());

This code actually Just convert the first letter to uppercase

<span style="color:#000000;font-family:NSimsun">(</span>{transform:"rotate(10deg)","transform-origin":"0 0"))

因为在js中修改样式的时候,是不存在-webkit-transformz这样的格式的,两个单词之间的"-"是必须要省略掉的,换成第二个单词的字母为大写.所以主要就是把这个处理好了之后久ok了<br><span style="color: #ff0000">注意点:1.因为如果不添加css3的过渡属性的话,旋转的时候是会有种卡顿效果的,就是旋转的时候不顺畅,所以我这里添加了transition属性,让他转动起来的时候看起来顺畅的.<br>　　　 2.transform-origin的值如果为0 0的时候,是绕着原点旋转的,50% 50%的时候就是绕着中心点旋转的.不过默认的时候就是绕着中心点旋转的<br></span>

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