var nowZoom=100; // ÇöÀçºñÀ²
var maxZoom=200; // ÃÖ´ëºñÀ²(500À¸·ÎÇϸé 5¹è Ä¿Áø´Ù)
var minZoom=80; // ÃÖ¼ÒºñÀ²
 
//È­¸é2
function zoomIn() {
if (nowZoom < maxZoom) {
/// nowZoom += 10; //25%¾¿ Ä¿Áø´Ù.
nowZoom += 4; //25%¾¿ Ä¿Áø´Ù.
} else {
return;
}
document.body.style.zoom = nowZoom + "%";
}
 
//È­¸é1
function zoomOut() {
if (nowZoom > minZoom) {
/// nowZoom -= 10; //25%¾¿ ÀÛ¾ÆÁø´Ù.
nowZoom -= 4; //25%¾¿ ÀÛ¾ÆÁø´Ù.
} else {
return;
}
document.body.style.zoom = nowZoom + "%";
}