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</nav> <div class="container"> <h1>�?能量换算�?/h1> <div class="card"> <div class="input-group"> <label for="input-----">输入数�?/label> <input type="number" id="value" value="1" min="0" step="any" aria-label="数字输入�? placeholder="请输入数字输入框" /> </div> <div class="input-group"> <label>选择单位</label> <select id="unit"> <option value="j" selected>焦�?(J)</option> <option value="kj">千焦 (kJ)</option> <option value="cal">卡路�?(cal)</option> <option value="kcal">千卡 (kcal)</option> <option value="wh">瓦时 (Wh)</option> <option value="kwh">千瓦�?(kWh)</option> <option value="ev">电子伏特 (eV)</option> <option value="btu">英热单位 (BTU)</option> </select> </div> <div class="results" id="results"></div> </div> </div> <script> const toJ = { j: 1, kj: 1000, cal: 4.184, kcal: 4184, wh: 3600, kwh: 3600000, ev: 1.602e-19, btu: 1055.06 }; const labels = { j: "焦�?(J)", kj: "千焦 (kJ)", cal: "卡路�?(cal)", kcal: "千卡 (kcal)", wh: "瓦时 (Wh)", kwh: "千瓦�?(kWh)", ev: "电子伏特 (eV)", btu: "英热单位 (BTU)" }; function convert() { const value = parseFloat(document.getElementById("value").value) || 0; const unit = document.getElementById("unit").value; const joules = value * toJ[unit]; let html = ""; for (const [key, factor] of Object.entries(toJ)) { const result = joules / factor; const formatted = result < 0.0001 || result > 999999999 ? result.toExponential(4) : result.toLocaleString("zh-CN", { maximumFractionDigits: 6 }); html += `<div class="result-item"><span class="result-label">${labels[key]}</span><span class="result-value">${formatted}</span></div>`; } document.getElementById("results").innerHTML = html; } document.getElementById("value").addEventListener("input", convert); document.getElementById("unit").addEventListener("change", convert); convert(); // Theme toggle function toggleTheme() { const html = document.documentElement; const currentTheme = html.getAttribute("data-theme"); const newTheme = currentTheme === "light" ? 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