<style> fieldset { width: 500px; height: 200px; margin: 0 auto; } </style> <body> <fieldset> <legend>输入数据</legend> 身高: <input type="text"><br> 体重: <input type="text"><br> 结果: <input type="text"><br> <button>点击</button> </fieldset> <script> const ino = document.querySelectorAll("input"); const buo = document.querySelector("button"); buo.onclick = function () { let bz = ino[1].value - (ino[0].value - 108) * 2 if (bz > 10) { ino[2].value = "偏胖" } else if (bz < -10) { ino[2].value = "偏瘦" } else { ino[2].value = "正常" } } </script> </body>
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