万能返回上一页，兼容移动端跟电脑

/*返回上一页*/
function return_prepage()
{
if(window.document.referrer==""||window.document.referrer==window.location.href)
{
window.location.href="/go.html?url={dede:type}[field:typelink /]{/dede:type}";
}else
{
window.location.href=window.document.referrer;
}

}
/*返回上一页*/
function return_prepage()
{
if(wi