用JavaScript将给定值除以.style.width

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我需要在Javascript中划分.style.width函数给定的值。 我的代码如下所示：

    var x = document.getElementsByClassName("item");
    var i;

    var v = x[0].style.width;

In variable 'v' I have some value in pixels, e.g. 200px width. I would need to divide this value by 2 to get 100px. But this formula doesn't work: var v = x[0].style.width / 2;

我究竟做错了什么？感谢帮助。