​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 数字</h1>
​
<p>整数（不使用指数或科学计数法）会被精确到 15 位：</p>
​
<p id="demo"></p>
​
<script>
var x = 999999999999999;
var y = 9999999999999999;
document.getElementById("demo").innerHTML = x + "<br>" + y;
</script>
​
</body>
</html>
​