<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 算术运算</h1>
<h2>运算符优先级</h2>
<p>乘法的优先级高于加法。</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = 100 + 50 * 3;
</script>
</body>
</html>