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= d/2) { showError('壁厚不能 ≥ 外径/2'); return; } var R = d/2; var r = R - t; var mass = Math.PI * (R*R - r*r) * l * 7.93 / 1e6; var html = '
重量
' + mass.toFixed(3) + ' kg
'; html += '
'; html += '外径: ' + d + ' mm, 壁厚: ' + t + ' mm, 长度: ' + l + ' mm
'; html += '截面积: ' + (Math.PI*(R*R-r*r)).toFixed(2) + ' mm²'; html += '
'; resultContent.innerHTML = html; resultMeta.textContent = mass.toFixed(3) + ' kg'; resultArea.classList.add('show'); }); document.getElementById('btn-clear').addEventListener('click', function() { form.reset(); document.getElementById('d').value = 50; document.getElementById('t').value = 3; document.getElementById('l').value = 1000; clearError(); clearResult(); }); })();