面试题

https://segmentfault.com/a/1190000015383749

1.

console.log(typeof [])
//"object"
console.log(typeof typeof [])
//=》typeof "object"
//"string"

因为typeof返回结果都是字符串

2.

<script type="text/javascript">
    var num = parseInt('width:35.5px');
    if (num == 35.5) {
        alert(0)
    } else if (num == 35) {
        alert(1)
    } else if (num == NaN) {
        alert(2)
    } else if (typeof num == 'number') {
        alert(3)
    } else {
        alert(4)
    }
    console.log(typeof num)//number
    console.log(typeof num == 'number')//true
    //3
    </script>