js实现图片旋转
1、以下代碼適用ie9版本
js代碼如下：
function rotate(o,p){
var img = document.getElementById(o);
if(!img || !p) return false;
var n = img.getAttribute('step');
if(n== null) n=0;
if(p=='right'){
(n==3)? n=0:n++;
}else if(p=='left'){
(n==0)? n=3:n--;
}
img.setAttribute('step',n);
//MSIE
if(document.all) {
img.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ n +')';
//HACK FOR MSIE 8
switch(n){
case 0:
img.parentNode.style.height = img.height;
break;
case 1:
img.parentNode.style.height = img.width;
break;
case 2:
img.parentNode.style.height = img.height;
break;
case 3:
img.parentNode.style.height = img.width;
break;
}
//DOM
}else{
var c = document.getElementById('canvas_'+o);
if(c== null){
img.style.visibility = 'hidden';
img.style.position = 'absolute';
c = document.createElement('canvas');
c.setAttribute("id",'canvas_'+o);
img.parentNode.appendChild(c);
}
var canvasContext = c.getContext('2d');
switch(n) {
default :
case 0 :
c.setAttribute('width', img.width);
c.setAttribute('height', img.height);
canvasContext.rotate(0 * Math.PI / 180);
canvasContext.drawImage(img, 0, 0);
break;
case 1 :
c.setAttribute('width', img.height);
c.setAttribute('height', img.width);
canvasContext.rotate(90 * Math.PI / 180);
canvasContext.drawImage(img, 0, -img.height);
break;
case 2 :
c.setAttribute('width', img.width);
c.setAttribute('height', img.height);
canvasContext.rotate(180 * Math.PI / 180);
canvasContext.drawImage(img, -img.width, -img.height);
break;
case 3 :
c.setAttribute('width', img.height);
c.setAttribute('height', img.width);
canvasContext.rotate(270 * Math.PI / 180);
canvasContext.drawImage(img, -img.width, 0);
break;
}
}
}
html主要代碼如下：
<div id="imgDiv">
<img id="showImg" onclick="rotate('showImg','right')" src="${ctx }/pwlp/supervise/supervise/getCaseImgTemplate.ht?id=${id }">
</div>
2、以下代碼適用谷歌、ie10、ie11版本
<!DOCTYPE html>
<html>
<head>
<title>圖片旋轉</title>
<script>
window.onload = function(){
var current = 0;
document.getElementById('showImg').onclick = function(){
current = (current+90)%360;
this.style.transform = 'rotate('+current+'deg)';
}
};
</script>
</head>
<body>
<img id ="showImg" src="">
</body>
3、以下代碼即適用ie9也適用谷歌、ie10、ie11版本（先判斷瀏覽器版本再綁定點擊事件）
js代碼如下：
window.onload = function(){
var current = 0;
document.getElementById('showImg').onclick = function(){
var browserVersion = myBrowser();
if(browserVersion == "IE9"){
rotate("showImg","right");
}else{
current = (current+90)%360;
this.style.transform = 'rotate('+current+'deg)';
}
}
};
function rotate(o,p){
var img = document.getElementById(o);
if(!img || !p) return false;
var n = img.getAttribute('step');
if(n== null) n=0;
if(p=='right'){
(n==3)? n=0:n++;
}else if(p=='left'){
(n==0)? n=3:n--;
}
img.setAttribute('step',n);
//MSIE
if(document.all) {
img.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ n +')';
//HACK FOR MSIE 8
switch(n){
case 0:
img.parentNode.style.height = img.height;
break;
case 1:
img.parentNode.style.height = img.width;
break;
case 2:
img.parentNode.style.height = img.height;
break;
case 3:
img.parentNode.style.height = img.width;
break;
}
//DOM
}else{
var c = document.getElementById('canvas_'+o);
if(c== null){
img.style.visibility = 'hidden';
img.style.position = 'absolute';
c = document.createElement('canvas');
c.setAttribute("id",'canvas_'+o);
img.parentNode.appendChild(c);
}
var canvasContext = c.getContext('2d');
switch(n) {
default :
case 0 :
c.setAttribute('width', img.width);
c.setAttribute('height', img.height);
canvasContext.rotate(0 * Math.PI / 180);
canvasContext.drawImage(img, 0, 0);
break;
case 1 :
c.setAttribute('width', img.height);
c.setAttribute('height', img.width);
canvasContext.rotate(90 * Math.PI / 180);
canvasContext.drawImage(img, 0, -img.height);
break;
case 2 :
c.setAttribute('width', img.width);
c.setAttribute('height', img.height);
canvasContext.rotate(180 * Math.PI / 180);
canvasContext.drawImage(img, -img.width, -img.height);
break;
case 3 :
c.setAttribute('width', img.height);
c.setAttribute('height', img.width);
canvasContext.rotate(270 * Math.PI / 180);
canvasContext.drawImage(img, -img.width, 0);
break;
}
}
}
function myBrowser(){
var userAgent = navigator.userAgent; //取得瀏覽器的userAgent字符串
var isOpera = userAgent.indexOf("Opera") > -1;
if (isOpera) {
return "Opera"
}; //判斷是否Opera瀏覽器
if (userAgent.indexOf("Firefox") > -1) {
return "FF";
} //判斷是否Firefox瀏覽器
if (userAgent.indexOf("Chrome") > -1){
return "Chrome";
}
if (userAgent.indexOf("Safari") > -1) {
return "Safari";
} //判斷是否Safari瀏覽器
if (userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera) {
if (userAgent.indexOf("MSIE 6.0") > -1) { return "IE6"; }
if (userAgent.indexOf("MSIE 7.0") > -1) { return "IE7"; }
if (userAgent.indexOf("MSIE 8.0") > -1) { return "IE8"; }
if (userAgent.indexOf("MSIE 9.0") > -1) { return "IE9"; }
if (userAgent.indexOf("MSIE 10.0") > -1) { return "IE10"; }
return "IE";
} //判斷是否IE6-9瀏覽器
if (userAgent.toLowerCase().indexOf("trident") > -1 && userAgent.indexOf("rv") > -1 && !isOpera) {
if (userAgent.indexOf("rv:10.0") > -1) { return "IE10"; }
if (userAgent.indexOf("rv:11.0") > -1) { return "IE11"; }
return "IE11";
} //判斷是否IE10-11瀏覽器
else
{
return userAgent;
}
}
html代碼如下：
<div id="imgDiv">
<img id="showImg" src="${ctx }/pwlp/supervise/supervise/getCaseImgTemplate.ht?id=${id }">
</div>
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