function get_cache_size(t){
    t = t == undefined ? "l" : "s";
    if(t==='l'){
        if(!window.localStorage) {
            console.log('瀏覽器不支援localStorage');
        }else{
            var size = 0;
            for(item in window.localStorage) {
                if(window.localStorage.hasOwnProperty(item)) {
                    size 
 
+= window.localStorage.getItem(item).length;
                }
            }
            console.log('當前localStorage容量為' + (size / 1024).toFixed(2) + 'KB');
        }
    }else{
        if(!window.sessionStorage) {
            console.log('瀏覽器不支援sessionStorage');
        }else{
            var size = 0;
            
 
for(item in window.sessionStorage) {
                if(window.sessionStorage.hasOwnProperty(item)) {
                    size += window.sessionStorage.getItem(item).length;
                }
            }
            console.log('當前sessionStorage容量為' + (size / 1024).toFixed(2) + 'KB');
        }
    }
}
get_cache_size(
 
'l');//localStorage當前大小
get_cache_size('s');//sessionStorage當前大小