js to achieve image fade-in and fade-out effect

This article shares the specific code of js to achieve image fade in and out for your reference. The specific content is as follows

Analysis process:

1. Add multiple images to the largest parent element and set the transparency of the first image to 1 opacity: 1

The transparency of the remaining images is 0;
Set a row of dots below the picture

2. Get each picture and dynamically set different levels, with the level size set from 4 to 0 in sequence;

Setz_index:function(){
        for(var i=0;i<this.Photo.length;i++){
            index=i;
            this.Photo[i].style.zIndex =this.Photo.length-i-1;
        }
    },

3. Set two ways for the image to appear, clockwise or counterclockwise; when the image changes, the corresponding dots also change. The image that appears has the highest level and a transparency of 1, while the transparency of the remaining images is 0, and the color of the corresponding small dots turns pink.

Animatezindex:function(math,count){
       for(var i=0;i<count;i++){
         for(var k=0;k<this.Photo.length;k++) {
            //console.log(1);
           var index = parseInt (this.Photo[k].style.zIndex ); //43210 04321 10432
           if(math=="n"){
             index++; //The dots change color from left to right if(index ==this.Photo.length){
                 index=0;
                 this.Photo[k].style.opacity =0;
                 this.Crclelist[k].style.background="#fff";
             }
             if(index==this.Photo.length-1){
                 this.Photo[k].style.opacity= 1;
                 this.Crclelist[k].style.background="pink";
                 this.Savecolor= this.Crclelist[k];

             }
           }
             else{
               index--; //The dot changes color from right to left if(index==-1){
                   index=this.Photo.length-1;
               }
               if(index==this.Photo.length-1){
                   this.Photo[k].style.opacity= 1;
                   this.Crclelist[k].style.background="pink";
                   this.Savecolor= this.Crclelist[k];
               }
               if(index==this.Photo.length-2){
                   this.Photo[k].style.opacity =0;
                   this.Crclelist[k].style.background="#fff";
               }
           }
             this.Photo[k].style.zIndex =index;
         }
       }
    },

4. Set the default value to make the color of the first dot pink. When the mouse slides into the largest parent element, the image stops rotating. When the mouse slides into the small dot, it is divided into two situations: entering from the left and right of the current dot.

Moren_set:function(){
        var that=this;
        that.Crclelist[0].style.background="pink";
        that.Savecolor =that.Crclelist[0];
        that.Bigblock.onmouseenter=function(){
            // console.log(1);
            window.cancelAnimationFrame(glider.Timeset);
        };
        that.Bigblock.onmouseleave=function(){
            glider.Timelines();
        }
        //Point events, follow the picture changes for(var i=0;i<that.Crclelist.length;i++){
            that.Crclelist[i].index=i;
            that.Crclelist[i].onmouseenter =function(){
              var oldindex=that.Savecolor.index;
              var newindex=this.index; //The index of the dot that the mouse slides into this refers to the sliding event of the current dot// console.log(newindex);
                if(newindex -oldindex >0) { //Enter from the right of the current dot var ri=newindex -oldindex;
                  // console.log(ri);
                    var le = that.Crclelist.length-ri;
                   // console.log(le);
                    if(ri<=le){
                        console.log("to the right",ri);
                        that.Animatezindex("n",ri);
                    }
                    if(ri>le){
                        console.log("to the left",le);
                        that.Animatezindex("s",le);
                    }
                }
                else if (newindex - oldindex < 0) {
                    var ri1=Math.abs(newindex-oldindex); //get the absolute value var le1=that.Crclelist.length-ri1;
                    if(ri1<=le1){
                        console.log("left", ri1);
                        that.Animatezindex("s",ri1);
                    }
                    if(ri1>le1){
                        console.log("right", le1);
                        that.Animatezindex("n",le1);
                    }

                }
            }
        }
    }

5. Set the rotation event to change the rotation of the image according to the time.

Timelines:function(){
        var nowtime = new Date().getTime();
        if((nowtime - glider.Oldtime) >= glider.TimeDely ){
            glider.Oldtime =nowtime;
            glider.Animatezindex ("n",1); //Change to the right}
        //You can use the setTimeout and setInterval methods to implement animation in the script.
        // But this may not be smooth enough and will take up extra resources.
        //The requestAnimationFrame method is used to notify the browser to resample the animation and play it in a loop.
        /*cancelAnimationFrame
        The cancelAnimationFrame method is used to cancel a previously scheduled animation frame update request. */
       glider.Timeset = window.requestAnimationFrame(glider.Timelines);
 }

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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