In-depth learning of jQuery Animate (3)

This article will give you an in-depth introduction to the usage of Animate in jQuery. It follows the previous article [JQuery - In-depth Learning of Animate (2)] so that everyone can further understand the use of animate in jQuery. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

progress

Type： Function( Promise animation, Number progress, Number remainingMs )

A function called after each step of animation is completed, regardless of animation As many properties as there are, each animated element performs a separate function. (version added: 1.8)

Number progress: Indicates the current animation progress level 0~1

Number remainingMs: It is the difference between the final animation property value and the difference

CSS code :

.block {
    position: relative;
    background-color: #abc;
    width: 40px;
    height: 40px;
    float: left;
    margin: 5px;
  }
  .wrap{position:relative;float:left;width:400px;}
  #go{border:1px solid red;color:blue;cursor:pointer;}

Html code:

<p>
    <button id="go">Run>></button>
</p>
<p class="wrap">
    <p class="block"></p>
    <p class="block"></p>
    <p class="block"></p>
    <p class="block"></p>
    <p class="block"></p>
    <p class="block"></p>
</p>

Javscript code:

var j=0,k=0;
    $( "#go" ).one("click",function() {
      $( ".block:first" ).animate(
          {
            left: 100,top:200
          },
          {
            duration: 1000,
            step: function( now, fx ){
                k++;
                if(k==1) console.log(fx);
              $( ".block:gt(0)" ).css( fx.prop, now );//注意到prop的变化性
            },
            progress:function(a,p,r){
                j++;
                if(j==1){console.log(a);console.log(a.props)}
                a.progress(function(){
                    console.log("Hi"+j);//注意progress的运行时机
                });                
                console.log(p+"---"+r);//注意p,r的变化
            }
      });
    });

Observe the value after the output on the console, you will get something!

Make a simple progress bar animation. It starts from red, turns to green at 30%, and turns to pink at 60%. There is no color change plug-in, and the choice is to replace the class. Let everyone have an understanding of this progress and step application. I hope this example will inspire others!

CSS code:

 .progressBar {
 	float: left;
 	position: relative;
 	width: 500px;
 	height: 30px;
 	border: 1px solid orange;
 	background-color: #999;
 }
 
 .progressBar p {
 	padding: 0;
 	margin: 0;
 	position: absolute;
 	left: 0;
 	top: 0;
 	height: 30px;
 }
 
 .red {
 	background-color: red;
 }
 
 .green {
 	background-color: green;
 }
 
 .pink {
 	background-color: pink;
 }

Html code:

 <p class="progressBar"> 
    <p class="progress"></p>
 </p>

Javascript code:

$(".progressBar p").addClass("red").animate({
	"width": 500
}, {
	duration: 5000,
	progress: function(a, p, r) {
		if(p > 0.3 && !$(this).hasClass("green")) $(this).removeClass().addClass("green");
		if(p > 0.6 && !$(this).hasClass("pink")) $(this).removeClass().addClass("pink");
	}
});

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