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。
width will be string. Convert it to number before dividing. This example uses getComputedStyle to get actual width of a dom element
let elem = document.getElementById('test');
let compStyles = window.getComputedStyle(elem);
const widthInteger = parseInt(compStyles.width, 10);
const halfWidth = widthInteger / 2;
console.log(halfWidth).test {
height: 200px;
width: 200px;
border: 1px solid green;
}<div class='test' id='test'></div>