JS代码：
<script type="text/javascript">
function load() {
init();
}
// 缩放图片
function imgToSize(oBool) {
var pic = document.getElementById("pic");
pic.style.zoom = parseInt(pic.style.zoom) + (oBool ? 2 : -2) + '%';
text.defaultValue=pic.style.zoom;
}
//还原尺寸
function restore() {
var pic = document.getElementById("pic");
pic.style.zoom = '100%';
pic.style.left = "0px";
pic.style.top = "0px";
text.defaultValue=pic.style.zoom;
}
// 旋转图片
var current = 0;
function imgRoll(direction) {
var pic = document.getElementById("pic");
if (direction == "left") {
current = (current - 90) % 360;
}
else if (direction == "right") {
current = (current + 90) % 360;
}
pic.style.transform = 'rotate(' + current + 'deg)';
}
//图片拖拽
drag = 0;
move = 0;
function mousedown() {
if (drag) {
X1 = window.event.x - parseInt(pic.style.left);
Y1 = window.event.y - parseInt(pic.style.top);
move = 1;
}
}
function onmouseover() {
drag = 1;
}
function mouseStop() {
window.event.returnValue = false;
}
function mousemove() {
if (move) {
pic.style.left = (window.event.x - X1) + "px";
pic.style.top = (window.event.y - Y1) + "px";
}
}
function mouseup() {
move = 0;
}
function init() {
var pic = document.getElementById("pic");
pic.style.zoom="100%";
pic.style.left="0px";
pic.style.top="0px";
pic.style.position="relative";
pic.style.cursor="move";
document.all.pic.onmouseover = onmouseover;
document.all.pic.onmousemove = mousemove;
document.all.pic.onmousedown = mousedown;
document.all.pic.onmouseup = mouseup;
document.all.pic.ondragstart = mouseStop;
}
</script>
html代码：
<body onload="load()">
<div style="text-align:center;">
<img id="pic" src="landscape-4615578_960_720.webp.jpg" />
</div>
<br/>
<div class="btn">
<button class="btnleft" onclick="imgRoll('left');">左转</button>
<button class="btnright" onclick="imgRoll('right');">右转</button>
<button class="btnup" onclick="imgToSize(1);">放大</button>
<button class="btndown" onclick="imgToSize(0);">缩小</button>
<button class="btnreturn" onclick="restore();">还原</button>
</div>
</body>
效果图：
