如果我正确理解了你的问题，那么也许这样做会有所帮助:

function testDistance(node1, node2) {
    /* get top position of node 1 */
    let n1Pos = node1.offsetTop;
    /* get height of node 1 */
    let n1Height = node1.clientHeight;
    /* get top position of node 2 */
    let n2Pos = node2.offsetTop;
    /* get height of node 2 */
    let n2Height = node2.clientHeight;

    /* add height of both nodes */
    let heightTogether = n1Height + n2Height;
    /* calculate distance from top of node 1 to bottom of node 2 */
    let actualDistance = (n2Pos + n2Height) - n1Pos;

    /* if the distance between top of node 1 and bottom of node 2
       is bigger than their heights combined, than there is something between them */
    if (actualDistance > heightTogether) {
        /* do something here if they are not together */
        console.log('they are not together');
    } else {
        /* do something here if they are together */
        console.log('together');
    } 
}

如果我正确理解了你的问题，那么也许这样做会有所帮助:

function testDistance(node1, node2) {
    /* get top position of node 1 */
    let n1Pos = node1.offsetTop;
    /* get height of node 1 */
    let n1Height = node1.clientHeight;
    /* get top position of node 2 */
    let n2Pos = node2.offsetTop;
    /* get height of node 2 */
    let n2Height = node2.clientHeight;

    /* add height of both nodes */
    let heightTogether = n1Height + n2Height;
    /* calculate distance from top of node 1 to bottom of node 2 */
    let actualDistance = (n2Pos + n2Height) - n1Pos;

    /* if the distance between top of node 1 and bottom of node 2
       is bigger than their heights combined, than there is something between them */
    if (actualDistance > heightTogether) {
        /* do something here if they are not together */
        console.log('they are not together');
    } else {
        /* do something here if they are together */
        console.log('together');
    } 
}

试一试:

var h = document.getElementById('someDiv').clientHeight;
var h = document.getElementById('someDiv').offsetHeight;
var h = document.getElementById('someDiv').scrollHeight;

clientHeight包括高度和垂直填充。

offsetHeight包括高度、垂直填充和垂直边框。

scrollHeight包括所包含文档的高度(在滚动的情况下会大于高度)、垂直填充和垂直边框。

style = window.getComputedStyle(your_element);

然后简单地:style.height

document.querySelector('.project_list_div').offsetHeight;

我用它来获取一个元素的高度(返回浮点数):

document.getElementById('someDiv').getBoundingClientRect().height

当您使用虚拟DOM时，它也可以工作。我在Vue中这样使用它:

this.$refs['some-ref'].getBoundingClientRect().height

对于Vue组件:

this.$refs['some-ref'].$el.getBoundingClientRect().height