简单教程
提交运行
代码编辑器:
<p> typeof 操作符返回变量或表达式的类型</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = typeof "john" + "<br>" + typeof 3.14 + "<br>" + typeof false + "<br>" + typeof [1,2,3,4] + "<br>" + typeof {name:'john', age:34}; </script>
运行结果: