JS设置自定义快捷键并实现图片上下左右移动

Z时代
2024-01-10
分类：综合

JS代码实现自定义热键

实现功能：

1.自定义上下左右键

2.使用自定义热键或者使用键盘上下左右键移动图片

效果图：

步骤1：

HTML代码：


<!DOCTYPE html>
<html>
 <head lang="en">
 <meta charset="UTF-8">
 <title>使用自定义按键实现图片移动</title>
 <style type="text/css">
  table {
  border-collapse: collapse;
  }
 </style>
 <script src="js/key.js"></script>
 </head>
 <body>
 <img id="img" src="img/Koala.jpg" align="center" style="width: 80px;height: 80px;position: absolute;left:0px;top: 0px" />
 <table align="center" border="1">
  <tr>
  <td align="center" colspan="2">修改上下左右键</td>
  </tr>
  <tr>
  <td>上：</td>
  <td><input type="text" onkeyup="myFunction('up')" maxlength="1"></td>
  </tr>
  <tr>
  <td>下：</td>
  <td><input type="text" onkeyup="myFunction('down')" maxlength="1"></td>
  </tr>
  <tr>
  <td>左：</td>
  <td><input type="text" onkeyup="myFunction('left')" maxlength="1"></td>
  </tr>
  <tr>
  <td>右：</td>
  <td><input type="text" onkeyup="myFunction('right')" maxlength="1"></td>
  </tr>
  <tr>
  <td align="center" colspan="2"><input type="button" value="确定" onclick="confirm()" /></td>
  </tr>
 </table>
 </body>
</html>

步骤2：

JS：


var up, down, left, right;
var up1, down1, left1, right1;
var obj = document.getElementById("img");
obj.left = 0;
obj.top = 0;
//通过设置四个不同参数来进行判断
function myFunction(str) {
 var Key = window.event.keyCode;
 //当str=设置的参数时把key赋值给up1
 if (str == "up") {
 up1 = Key;
 }
 if (str == "down") {
 down1 = Key;
 }
 if (str == "left") {
 left1 = Key;
 }
 if (str == "right") {
 right1 = Key;
 }
}
//确定函数事件
function confirm() {
 //把up1赋值给up
 up = up1;
 down = down1;
 left = left1;
 right = right1;
 alert("您设置的热键键值为:" + up + ";" + down + ";" + left + ";" + right);
 fkey();
}
function fkey() {
 console.log(event.keyCode);
 var Key = window.event.keyCode;
 //获取你自定义的键和键盘上下左右键都可以用
 if (Key == 37 || Key == parseInt(left)) {
 //左
 obj.left -= 80;
 }
 if (Key == 38 || Key == parseInt(up)) {
 //上
 obj.top -= 80;
 }
 if (Key == 39 || Key == parseInt(right)) {
 //右
 obj.left += 80;
 }
 if (Key == 40 || Key == parseInt(down)) {
 //下
 obj.top += 80;
 }
 obj.style.left = obj.left + "px", obj.style.top = obj.top + "px";
}
document.onkeydown = fkey;