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

<h2>JavaScript 全局函数</h2>

<h2>parseInt()</h2>

<p>全局 JavaScript 函数 parseInt() 将字符串转换为数字:</p>

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

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

</body>
</html>
运行结果: