Detailed explanation of js motion event function

The example in this article shares the js motion event function for your reference. The specific content is as follows

HTML

The Dog
Split between cat,belong to the cat family,cat,cat,is the world's more widely

in the family pet.Cats ancestors is presumably desert cats






拉布拉多
Labrador

拉布拉多猎犬因原产地在加拿大的纽芬兰与拉布拉多省而得名。拉布拉多犬是一种中大型犬类，个性忠诚、大气、憨厚、温和、阳光、开朗、活泼，智商极高，也对人很友善，是非常适合被选作经常出入公共场合的导盲犬或地铁警犬及搜救犬和其他工作犬的狗品种，跟哈士奇（西伯利亚雪撬犬）和金毛猎犬并列三大无攻击性犬类，拉布拉多智商位列世界犬类第七。



 

CSS layout style omitted

Now I set the style of a.lookdog to position:absolutely, width and height Set to 0. Special effects achieved: When the mouse moves into div.img, the buffer animation of automatically expanding the width and height of a.lookdog is realized, and after the expansion is completed, the mask background layer becomes lower in transparency. Of course, we can also use CSS3 to achieve this kind of special effect, but the pitfall of CSS3 is that it does not fully support IE browser, so it is ideal to use JavaScript to implement motion buffer animation.

javascript

Function encapsulation part

//根据类名和父对象ID获取属性节点，解决getelementsByClass对浏览器的兼容性问题
 
function getbyclass(classname,parent){
 
    //传入ID获取父节点，如果该参数为空就为document
 
  
var oParent=parent?document.getElementById(parent):document;
 
    //定义一个空数组来存放属性节点
 var els=[];
 
    //定义一个数组存放父对象的所有子节点
 
  
var elements=oParent.getElementsByTagName("*");
 
    //遍历所有子节点，根据类名把所有的子对象找出来，并且放在els数组内
 for(var i=0;i0?Math.ceil(speed):Math.floor(speed);
  if(speed==0){
clearInterval(obj.timer);
if(continuefunction) continuefunction();//回调函数，判断是否有多次执行
  }else{
obj.style[stylename]=(offvalue+speed)/100;
obj.style.filter="alpha(opacity:"+(offvalue+speed)+")";
  }
}else{
var offvalue=parseInt(getStyle(obj,stylename));
var speed=(jason[stylename]-offvalue)/average;
  speed=speed>0?Math.ceil(speed):Math.floor(speed);
  if(speed==0){
clearInterval(obj.timer);
if(continuefunction) continuefunction();
  }else{
obj.style[stylename]=offvalue+speed+"px";
  }
  }
}
},cycle);
}

Page initialization function, method call

window.onload=function(){
 
var imgdog=getbyclass("img","breedsdog");//在父对象breedsdog上找到所有的div.img
 
    //给所有的div.img添加鼠标移入，鼠标移出事件
for(var i=0;i
 
The effect of moving the mouse in and out is as follows, I added a few more div.img, you can see the same width The high change is complete, and then the transparency changes.