​x
 
<!DOCTYPE html>
<html>
<body>
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<p>单击按钮可显示 1 + 不同数字的自然对数（以 E 为底）。</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.log1p(2.7183);
  var b = Math.log1p(2);
  var c = Math.log1p(1);
  var d = Math.log1p(0);
  var e = Math.log1p(-1);
​
  var x = a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e;
  document.getElementById("demo").innerHTML = x;
}
</script>
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</body>
</html>
​