获取url参数

function getQueryVariable(name) {
    let search = window.location.search.substr(1) || window.location.hash.split("?")[1];
    let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    let r = search ? search.match(reg) : null;
    if (r != null) return unescape(r[2]);
    return null;
}