<html><body><form oninput="x.value=parseInt(a.value)+parseInt(b.value)">0<input type="range" id="a" value="50">100+<input type="number" id="b" value="50">=<output name="x" for="a b"></output></form><p><strong>注意:</strong> Internet Explorer 不支持 output 标签。</p></body></html>