output 与 input对应，一个是输入,一个是输出.
<form oninput="result.value=parseInt(a.value)+parseInt(b.value)"> <input type="range" name="b" value="50" /> + <input type="number" name="a" value="10" /> = <output name="result"></output></form>
output 与 input对应，一个是输入,一个是输出.
<form oninput="result.value=parseInt(a.value)+parseInt(b.value)"> <input type="range" name="b" value="50" /> + <input type="number" name="a" value="10" /> = <output name="result"></output></form>
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