JS javascript 点击鼠标 鼠标事件 获取元素 获取元素Xpath

function mouse_down(event){   
    var x = event.clientX, y = event.clientY
    var element = document.elementFromPoint(x, y)
     if (!element) {
     console.log("error: no element")
    } 
     console.log(readXPath(element))
}
function readXPath(element) {   
    count = 1
    result = ""
    while (true){
        count += 1
        if(count>99){
            break
        }
        if (element == document.body){
            console.log('/html/body/' + result)
            break
        }
        else
        {
            tag_index = 0
            tmp = element.parentElement
            for(var i=0;i<tmp.childElementCount;i++){
                if (tmp.children[i].tagName == element.tagName){
                    tag_index += 1
                }
                if (element == tmp.children[i]){                    
                    result = element.tagName.toLowerCase() + "[" + String(tag_index) + "]" + "/" +result
                    // console.log(result)
                    break
                }
            }
            element = tmp
        }
    }
}
document.onmousedown = mouse_down