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1e6 ? n.toExponential(6) : n.toFixed(6).replace(/\.?0+$/, '')); } form.addEventListener('submit', function(e) { e.preventDefault(); clearError(); clearResult(); var v1 = parseFloat(document.getElementById('val1').value); var v2 = parseFloat(document.getElementById('val2').value); if (isNaN(v1) || isNaN(v2)) { showError('请输入有效数值'); return; } try { var r = {"布氏硬度 HB": "2 * v1 / (Math.PI * 10 * (10 - Math.sqrt(100 - v2*v2)))"}; var html = '
'; Object.keys(r).forEach(function(k) { html += '
' + k + '
' + fmt(eval(r[k])) + '
'; }); html += '
'; resultContent.innerHTML = html; resultMeta.textContent = '共计算 ' + Object.keys(r).length + ' 项'; resultArea.classList.add('show'); } catch(err) { showError('计算错误: ' + err.message); } }); btnClear.addEventListener('click', function() { form.reset(); clearError(); clearResult(); }); })();