Of Stack

js realizes barrage aircraft effect

  • 2021-08-09 06:50:34
  • OfStack

In this paper, we share the specific code of js to realize the barrage aircraft effect for your reference. The specific contents are as follows 


<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8">
 <title></title>
 <style type="text/css">
 body{
   width: 70vw;/* The length and width are preferably obj Multiple of */
   height: 90vh;
   border-width: 10px;
   border-style: solid;
   border-color: blue;
   line-height:600px;/* Vertical center of text */
   text-align: center;/* Text centered horizontally */
   position: relative;/* Relative positioning */
   left: 0px;
   top: 0px;
  }
 
  /* Opening animation */
 @-webkit-keyframes mymove
 {
 from {top:50vh;}
 to {top:100px;}
 }
 
 #obj{
 -webkit-animation-name:mymove;
 -webkit-animation-duration:1s;
 -webkit-animation-timing-function:linear;
   position: absolute;
   left: 30vw;
   top: 50vh;
 width: 0px;
   height: 0px;
   border-left: 30px solid transparent; 
 border-right: 30px solid transparent; 
 border-bottom: 10px solid red; 
 }
 div{
   text-align: center;
   line-height:30px;
  }
 </style>
</head>
<body>
<!-- Barrage aircraft 
1. Airplanes can move 
2. Random barrage rain at the top of the screen 
3. The barrage rain hit the plane - Failure 
4. Record score 
-->
 
<div id='obj'> Aircraft </div>
 
<button id='start'> Begin </button> | 
<button onclick="stop()"> Suspend </button>
 
</body>
<script type="text/javascript">
 
 var key = document.body.onkeydown =f; // Registration keydown Event handler 
 
 var clientH= document.body.clientHeight;// Get body Gao 
 var clientW= document.body.clientWidth;// Get body Width 
 
 var obj=document.getElementById('obj');// Aircraft object 
 var borderX=parseInt(getComputedStyle(obj,null).getPropertyValue('border-left'));
 var borderY=parseInt(getComputedStyle(obj,null).getPropertyValue('border-bottom'));
 var movePx=10;// The distance of each movement of the aircraft 
 var speed=500;// Rain falling speed 
 var distance=10;// Rain falling distance 
 var rainleft=0;// Barrage rain x Coordinates 
 var raintop=0;// Barrage rain y Coordinates 
 
 // Formed rain 
 function setrain(){
 
 rainleft=parseInt(Math.random()*clientW);
  raintop=0;//parseInt(Math.random()*clientH);
 
 let div=document.createElement('div');
 div.className ='div';
 div.style.borderRadius='50%';
 div.style.width='6px';
 div.style.height='10px';
 div.style.backgroundColor='pink';
 div.style.position = 'absolute';
  div.style.left=rainleft + 'px';
  div.style.top=raintop + 'px';
 document.body.appendChild(div);
 }
 
 // Rain falling 
 function downrain(){
 
 var myTop=parseInt(getComputedStyle(obj,null).getPropertyValue('top'));// Get the wizard y Coordinates 
  var myLeft=parseInt(getComputedStyle(obj,null).getPropertyValue('left'));// Get the wizard x Coordinates 
 
 let div=document.getElementsByClassName('div');
 // Traversal all Raindrops 
 for(let i=0;i<div.length-1;i++){
 let divleft=parseInt(div[i].style.left);
 let divtop=parseInt(div[i].style.top);
 div[i].style.top=divtop+distance+'px';
 
 // Determine whether the plane was hit or not 
 if(Math.abs(divtop-myTop)<borderY && Math.abs(divleft-myLeft)<borderX){
 console.log(' Be hit  borderY:'+borderY+' borderX:'+borderX);
 console.log('------- myTop:'+myTop+' myLeft:'+myLeft);
 console.log('------- rainY:'+divtop+' rainX:'+divleft);
 stop();
 alert(' Be hit ');
 }
 }
 }
 
 // Clear the falling rain 
 function delrain(){
 let div=document.getElementsByClassName('div');
 // Traversal all Raindrops 
 for(let i=0;i<div.length-1;i++){
 // div[i].style.left
 if(parseInt(div[i].style.top)>clientH){
 div[i].parentNode.removeChild(div[i]);
 };
 }
 }
 
 // Begin 
 document.getElementById('start').onclick=start;
 function start(e){
 var e = e || window.event; // Standardized event handling 
 inter=setInterval((setrain),speed);
 inter1=setInterval((downrain),speed);
 inter2=setInterval((delrain),speed);
 }
 
 // Suspend 
 function stop(){
 clearInterval(inter);
 clearInterval(inter1);
 clearInterval(inter2);
 }
 
 // Mobile aircraft 
 function f (va) {
  var e = e || window.event; // Standardized event handling 
  let s = '';//val.type + " " + val.key; // Gets the keyboard event type and pressed value 
  let key=va.key;
  var myTop=parseInt(getComputedStyle(obj,null).getPropertyValue('top'));// Get the wizard y Coordinates  parseInt(obj.style.top);
  var myLeft=parseInt(getComputedStyle(obj,null).getPropertyValue('left'));// Get the wizard x Coordinates  parseInt(obj.style.left);
  var myWidth=borderX;
  var myHeight=borderY;
 
  var move=0;
  if(key=='w'){
   move=myTop-movePx;// Every move 10
   if(move<0 || move>clientH){
    return false;// Can't exceed the boundary 
   }
   obj.style.top=move+'px';
   s=' Upper ';
  }
  if(key=='s'){
   move=myTop+movePx;
   if(move<0 || move>clientH-myHeight){
    return false;
   }
   obj.style.top=move+'px';
   s=' Under ';
  }
  if(key=='a'){
   move=myLeft-movePx;
   if(move<0 || move>clientW){
    return false;
   }
   obj.style.left=move+'px';
   s=' Left ';
  }
  if(key=='d'){
   move=myLeft+movePx;
   if(move<0 || move>clientW-myWidth){
    return false;
   }
   obj.style.left=move+'px';
   s=' Right ';
  }
  // obj.innerText=s;// Set text  &  Know the previous elements 
  // console.log(move+' top:'+myTop+' left:'+myLeft);
 
 } /*f() end--*/
 
</script>
</html>
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