使用 onmouseover 和 onmouseout 事件切换大小写

Question

我一直在尝试让开关同时使用 onmouseover 和 onmouseout，但我不知道如何将其绑定到事件。提前感谢您的帮助

<script>
function img(img){
switch(img)
{
case "showSq": 
document.getElementById("square").innerHTML = '<img src="square.png">';
break;
case "hideSq": 
document.getElementById("square").innerHTML = '';
break;
case "showCr": 
document.getElementById("circle").innerHTML = '<img src="circle.png">';
break;
case "hideCr": 
document.getElementById("circle").innerHTML = '';
break;
}}
</script> 
<body>
<div id=right>
<h1> Geometry </h1>
<p>
<span onmouseover="img(showSq)" onmouseout="img(hideSq)"> SQUARE</span>,
<span onmouseover="img(showCr)" onmouseout="img(hideCr)"> CIRCLE </span>
</p>
<p> <span id="circle"> <span id="square"> </p>
</div>

Answer 1

你的参数应该是 img('showSq') 并且缺少 <span> 标签 </span> 标签

<p> <span id="circle"></span> <span id="square"></span> </p>

Answer 2

添加单庭做成一串函数参数

<span onmouseover="img('showSq')" onmouseout="img('hideSq')"> SQUARE</span>,
<span onmouseover="img('showCr')" onmouseout="img('hideCr')"> CIRCLE </span>

使用 onmouseover 和 onmouseout 事件切换大小写

Switch cases with onmouseover and onmouseout events

javascript

switch-statement

case

onmouseover

onmouseout