var BMIJS = documentgetElementByIdBMIJS; BMI BMIJSonclick = function var SG = parseFloatdocumentgetElementByIdSGvalue; var TZ = parseFloatdocumentgetE

function calculateBMI() { var SG = parseFloat(document.getElementById('SG').value); var TZ = parseFloat(document.getElementById('TZ').value); var JSTEXT = document.getElementById('JSTEXT'); JSTEXT.style.display = "inline-block"; if (!isNaN(SG) || !isNaN(TZ)) { //BMI = (体重*0.5)/身高/100∧2 var BMI = (TZ * 0.5) / Math.pow(SG / 100, 2); var SpictBMI = BMI.toFixed(2); if (SpictBMI >= 18.5 && SpictBMI <= 23.9) { JSTEXT.innerHTML = "您的BMI指数是:" + SpictBMI + ",身体状态[正常]" } else if (SpictBMI >= 24.0 && BMI <= 27.9) { JSTEXT.innerHTML = "您的BMI指数是:" + SpictBMI + ",身体状态[超重]" } else if (SpictBMI > 28.0) { JSTEXT.innerHTML = "您的BMI指数是:" + SpictBMI + ",身体状态[肥胖]" } else { JSTEXT.innerHTML = "您的BMI指数是:" + SpictBMI + ",身体状态[偏轻]" } } else { JSTEXT.innerHTML = "请提交正常的身高体重!!!" } }

var BMIJS = document.getElementById('BMIJS'); BMIJS.onclick = calculateBMI; // 将计算BMI的函数绑定到按钮的点击事