de-net/src/uilts/help.js

export function getQueryString(name) {
    let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i")
    let r = window.location.search.substr(1).match(reg)
    if (r != null) {
        return window.decodeURIComponent(r[2])
    }
    return null
 }