//实时显示鼠标在页面中的位置
    var inp = document.querySelector("div");
    document.addEventListener("mousemove", function (e) {
        inp.style.position = "absolute";
        inp.style.height = "3000px";
        inp.innerHTML = "(" + e.pageX + "," + e.pageY + ")";
        inp.style.top = e.pageY + "px";
        inp.style.left = e.pageX + "px"

    })