标签:html5 it js
本文为H5EDU机构官方HTML5培训教程,主要介绍:JavaScript强化教程——DOM编程(两种控制div移动的方法)
第一种 按钮控制
首先 创建两个html按钮和一个div并给div一个样式
input type="button" value="左" id="1"> <input type="button" value="右" id="2"> <div id="3">
div { width: 100px; height: 100px; background-color: bisque; position: absolute; left: 100px; top: 100px; }
然后在script中获得div和两个按钮
var left = document.getElementById("2"); var right = document.getElementById("1"); var div = document.getElementById("3");
然后添加onclick函数
left.onclick = function () { } right.onclick = function () { }
设置一个变量,控制div的left改变
var x = 100;
当点击按钮时触发
left.onclick = function () { x=x+10; div.style.left = x+"px"; } right.onclick = function () { x=x-10; div.style.left = x+"px"; }
源码:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> div { width: 100px; height: 100px; background-color: bisque; position: absolute; left: 100px; top: 100px; } </style> </head> <body> <input type="button" value="左" id="1"> <input type="button" value="右" id="2"> <div id="3"> </div> <script> var left = document.getElementById("2"); var right = document.getElementById("1"); var div = document.getElementById("3"); var x = 100; left.onclick = function () { x=x+10; div.style.left = x+"px"; } right.onclick = function () { x=x-10; div.style.left = x+"px"; } </script> </body> </html>
第二种,键值控制
同样在html中创建div并给其样式
<div id="3"> </div>
<style> div { width: 100px; height: 100px; background-color: bisque; position: absolute; left: 100px; top: 100px; } </style>
在script里面 获得div
var div=document.getElementById("3");
然后声明两个变量控制改变div的left和top
var px=100; var py =100;
然后获得键值
document.onkeydown(在document文档对象中,按任何键都会触发此函数)
alert中输出的event.keyCode会对应按键时,当前键相应的事件值(即每一个按键对应为一个键值)
document.onkeydown = function(){ alert(event.keyCode); }
然后通过测试上下左右得到键值,在swich语句中改变div的left和top改变其位置
switch (event.keyCode){ case 37: px = px-10; div.style.left = px+"px"; break; case 38: py = py-10; div.style.top = py+"px"; break; case 39: px = px+10; div.style.left = px+"px"; break; case 40: py = py+10; div.style.top = py+"px"; break; }
源码:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> div { width: 100px; height: 100px; background-color: bisque; position: absolute; left: 100px; top: 100px; } </style> </head> <body> <div id="3"> </div> <script> var div=document.getElementById("3"); var px=100; var py =100; document.onkeydown = function(){ // alert(event.keyCode); switch (event.keyCode){ case 37: px = px-10; div.style.left = px+"px"; break; case 38: py = py-10; div.style.top = py+"px"; break; case 39: px = px+10; div.style.left = px+"px"; break; case 40: py = py+10; div.style.top = py+"px"; break; } } </script> </body> </html>
点击进入:JS强化教程
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JavaScript强化教程——DOM编程(两种控制div移动的方法)
标签:html5 it js
原文地址:http://11732655.blog.51cto.com/11722655/1791740