window <\/strong>\u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 b\u1edfi t\u1ea5t c\u1ea3 c\u00e1c tr\u00ecnh duy\u1ec7t. N\u00f3 x\u1eed l\u00fd c\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\nT\u1ea5t c\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng JavaScript, c\u00e1c h\u00e0m v\u00e0 c\u00e1c bi\u1ebfn t\u1ef1 \u0111\u1ed9ng tr\u1edf th\u00e0nh th\u00e0nh vi\u00ean c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng c\u1eeda s\u1ed5.<\/p>\n\n\n\n
C\u00e1c bi\u1ebfn to\u00e0n c\u1ee5c tr\u1edf th\u00e0nh thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng c\u1eeda s\u1ed5.<\/p>\n\n\n\n
C\u00e1c bi\u1ebfn to\u00e0n c\u1ee5c l\u00e0 ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng c\u1eeda s\u1ed5.<\/p>\n\n\n\n
Th\u1eadm ch\u00ed \u0111\u1ed1i t\u01b0\u1ee3ng t\u00e0i li\u1ec7u (c\u1ee7a HTML DOM) l\u00e0 thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng c\u1eeda s\u1ed5:<\/p>\n\n\n\n
window.document.getElementById(\"header\");<\/code><\/pre>\n\n\n\nc\u0169ng gi\u1ed1ng nh\u01b0:<\/p>\n\n\n\n
document.getElementById(\"header\");<\/code><\/pre>\n\n\n\n
\n\n\n\n<\/span>K\u00edch c\u1ee1 c\u1eeda s\u1ed5<\/span><\/h2>\n\n\n\nHai thu\u1ed9c t\u00ednh c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh k\u00edch c\u1ee1 c\u1ee7a c\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\n
Hai thu\u1ed9c t\u00ednh tr\u1ea3 v\u1ec1 k\u00edch c\u1ee1 d\u01b0\u1edbi d\u1ea1ng pixel:<\/p>\n\n\n\n
- window.innerHeight – chi\u1ec1u cao b\u00ean trong c\u1ee7a c\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t (d\u1ea1ng pixels);<\/li>
- window.innerWidth – chi\u1ec1u r\u1ed9ng b\u00ean trong c\u1ee7a c\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t (d\u1ea1ng pixels);<\/li><\/ul>\n\n\n\n
C\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t (khung nh\u00ecn tr\u00ecnh duy\u1ec7t) KH\u00d4NG bao g\u1ed3m thanh c\u00f4ng c\u1ee5 v\u00e0 thanh tr\u01b0\u1ee3t.<\/p>\n\n\n\n
Cho Internet Explorer 8, 7, 6, 5:<\/p>\n\n\n\n