Several usages and precautions of animate in jQuery
1. animate syntax structure
animate(params,speed,callback)
params: a mapping containing style attributes and values, such as {key1:value1,key2:value2}
speed: Speed parameter [optional]
callback: function executed when the animation is completed [optional]
2. Customize simple animation
Use a simple example To illustrate, click on a div to achieve the effect of horizontal floating on the page.
<style>
#cube{
position:relative;/* 不加这句元素不能动 */
width:30px;
height:30px;
background:red;
cursor:pointer;
}
</style>
<body>
<div>
<div id="cube"></div>
</div>
<script>
$(function(){
$("#cube").click(function(){
$(this).animate({left:"100px"},2000)
})
})
</script>
In order to make the element move, you need to change the left attribute. In order to affect the element's top, right, bottom, and left attribute values, the element's position must be declared.
3. Accumulation and Accumulation Subtraction Animation
In the previous code, the attribute {left: "100px"} was set as a parameter , if rewritten as {left:"+=25px"}, the effect is as follows
$(this).animate({left:"+=25px",height:"+=20px"},1000)
##5. Execute multiple animations in sequence
In the above example, sliding to the right and increasing the height occur at the same time. If you want the box to slide to the right first and then become taller, you only need to split the code
as follows:
$(this).animate({left:"+=25px"},500)
.animate({height:"+=20px"},500)
The execution of animation effects like this has a sequence, which is called "animation queue"
## 6. Comprehensive Example
Click the square to make it move to the right while increasing its height and opacity from 50% to 100%, then move it up and down, widen, and fade out when finished.
$("#cube").click(function(){
$(this).animate({left:"100px",height:"100px",opacity:"1"},500)
.animate({top:"40px",width:"100px"},500)
.fadeOut('slow')
})7. Animation callback function
In the above example, if you want to switch the css style (background: blue) in the last step, instead of Fade out, if handled as usual, the relevant code is as follows:
$("#cube").click(function(){
$(this).animate({left:"100px",height:"100px",opacity:"1"},500)
.animate({top:"40px",width:"100px"},500)
.css("border","5px solid blue")//改动这行
})The reason for this problem is that the css() method will not be added to the animation queue, but will be executed immediately. You can use callback functions to implement queuing for non-animated methods. 
$("#cube").click(function(){
$(this).animate({left:"100px",height:"100px",opacity:"1"},500)
.animate({top:"40px",width:"100px"},500,function(){
$(this).css("border","5px solid blue")
})
})It is worth noting that callback applies to all jquery animation methods, such as slideDown(), show(), etc. 
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