<form oninput="totalPrice.value=parseInt(price.value)*parseInt(number.value)"> <input type="text" id="price" value="5000"> *<input type="number" id="number" value="1"> =<output name="totalPrice" for="price number"></output> </form>
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转载自blog.csdn.net/AsaZyf/article/details/82919500
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