alert(msg) 浏览器弹出警示框 console.log(msg) 浏览器控制台打印输出信息(给程序员看的) propmt(info) 浏览器弹出框,用户可输入
<!DOCTYPE html>
<html>
<body>
<script>
prompt('请输入您的年龄');
alert('计算的结果是:');
console.log('我是程序员能看达到的')
</script>
</body>
</html>
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