Huong dan tao css thay doi giao dien ngay dem: Dau tien ban phai co kien thuc ve css,biet su dung ,biet chinh sua va thong thao cac thuat ngu cua css.Muon thay doi giao dien ngay dem ban can tao 2 file css co ten la: sang.css va toi.css luu y: 2 file nay can co ten cac lop giong nhau vi du:rmenu thi css kia cung co lop rmenu de khi ta su dung div duoc de dang .Sau do ta them code nay: <script language="javascript"> var dkq; var H = new Date(); if (H.getHours() > 17) { dkq = 'toi'; } else { if (H.getHours() > 6) { dkq = 'sang'; } } if (H.getHours() < 6) { dkq = 'toi'; } document.write('<link rel="stylesheet" type="text/ css " href="/thư_mục_chứa_css/'); document.write(dkq); document.write('. css " media="all,handheld" />'); </script> vao dau trang muon thay doi giao dien ngay dem hoac muon ca trang thi them vao file _header
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