获取 url 参数

function getUrlParam(sUrl, sKey) {
    let li = (sUrl.indexOf('?')!=-1?sUrl.split('?')[1]:sUrl).split('#')[0].split('&').map(item=>item.split('='))
    let res = {}
    li.forEach(item=>{
        if(!res[item[0]]) res[item[0]] = item[1]
        else{
            if (Array.isArray(res[item[0]])) res[item[0]].push(item[1])
            else res[item[0]] = [res[item[0]],item[1]]
        }
    })
    return sKey?res[sKey]||'':res
}