代码示例:(标识:jsck_number)
<!DOCTYPE html>
<html>
<body>

<p>请单击按钮将变量转换为数字。</p>

<button onclick="myFunction()">试一试</button>

<p id="demo"></p>

<script>
function myFunction() {
  var x1 = true;
  var x2 = false;
  var x3 = new Date();
  var x4 = "999";
  var x5 = "999 888";

  var n = 
  Number(x1) + "<br>" + 
  Number(x2) + "<br>" + 
  Number(x3) + "<br>" + 
  Number(x4) + "<br>" + 
  Number(x5);
  document.getElementById("demo").innerHTML = n;
}
</script>

</body>
</html>
运行结果: