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<!DOCTYPE html>
<html>
<body>
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<p>单击该按钮可返回最接近的数字的 32 位单精度浮点表示。</p>
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<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
function myFunction() {
  var a = Math.fround(2.60);
  var b = Math.fround(2.50);
  var c = Math.fround(2.49);
  var d = Math.fround(-2.60);
  var e = Math.fround(-2.50);
  var f = Math.fround(-2.49);
​
  var x = a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e + "<br>" + f;
  document.getElementById("demo").innerHTML = x; 
}
</script>
​
</body>
</html>
​