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

<h1>JavaScript 数字</h1>

<h2>parseInt() 方法</h2>

<p>Number.parseInt() 将字符串转换为整数:</p>

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

<script>
document.getElementById("demo").innerHTML = 
  Number.parseInt("-10") + "<br>" +
  Number.parseInt("-10.33") + "<br>" +
  Number.parseInt("10") + "<br>" +
  Number.parseInt("10.33") + "<br>" +
  Number.parseInt("10 6") + "<br>" +  
  Number.parseInt("10 years") + "<br>" +  
  Number.parseInt("years 10");  
</script>

</body>
</html>
运行结果: