Home
HTML
HTML
Tryit: HTML
运行 ❯
×
Change Orientation
Change Theme, Dark/Light
<!DOCTYPE html> <html> <head> <style> #p1 { background-color: yellow; } </style> </head> <body> <h1>opacity 透明度属性</h1> <p id="p1">从下面的列表中选择一个值，以更改此元素的不透明度！</p> <select onchange="myFunction(this);" size="5"> <option>0 <option>0.2 <option>0.5 <option>0.8 <option selected="selected">1 </select> <script> function myFunction(x) { // 返回选中选项的文本 var opacity = x.options[x.selectedIndex].text; var el = document.getElementById("p1"); if (el.style.opacity !== undefined) { el.style.opacity = opacity; } else { alert("您的浏览器不支持此示例！"); } } </script> </body> </html>