​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 数字</h1>
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<p>书写 JavaScript 数值既可以带小数点，也可以不带：</p>
​
<p id="demo"></p>
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<script>
var x = 3.14;
var y = 3;
document.getElementById("demo").innerHTML = x + "<br>" + y;
</script>
​
</body>
</html>
​