Js后退刷新

$(function () {
a= get('refresh');
if(a=null || a=''){
set('refresh','refresh')
}
if(a==='refresh'){
localStorage.clear();
location.reload()
}
})

function set(Key,val) {
    return localStorage.setItem(Key, val);
}

function get(Key) {
    return localStorage.getItem(Key);
}