| 1 | <html>
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| 2 | <body>
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| 3 | <input type="file" id="upimg">
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| 4 | <script src="./jquery.js"></script>
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| 5 | <br>
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| 6 | <textarea style="width:300px;height:200px;" class="body"></textarea>
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| 7 | <br>
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| 8 | <img class="img">
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| 9 | <script>
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| 10 | $(function(){
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| 11 | var fimg=$('#upimg');
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| 12 | var img=new Image();
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| 13 | var dw=400,dh=300;
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| 14 | fimg.on('change',function(ev){
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| 15 | $(".body").text("");
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| 16 | $(".img").attr("src","");
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| 17 | var f=ev.target.files[0];
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| 18 | if(f.type.match('image.*')){
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| 19 | var r = new FileReader();
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| 20 | r.onload = function(e){
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| 21 | img.setAttribute('src',e.target.result);
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| 22 | };
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| 23 | r.readAsDataURL(f);
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| 24 | }
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| 25 | });
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| 26 | img.onload=function(){
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| 27 | ih=img.height,iw=img.width;
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| 28 | if(iw/ih > dw/dh && iw > dw){
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| 29 | ih=ih/iw*dw;
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| 30 | iw=dw;
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| 31 | }else if(ih > dh){
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| 32 | iw=iw/ih*dh;
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| 33 | ih=dh;
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| 34 | }
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| 35 | var cv = document.createElement('div');
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| 36 | cv.innerHTML="<canvas></canvas>";
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| 37 | var rc = cv.children[0];
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| 38 | var ct = rc.getContext('2d');
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| 39 | rc.width=iw;
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| 40 | rc.height=ih;
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| 41 | ct.drawImage(img,0,0,iw,ih);
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| 42 | var da=rc.toDataURL();
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| 43 | $(".body").text(da);
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| 44 | $(".img").attr("src",da);
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| 45 | }
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| 46 | });
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| 47 | </script>
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| 48 | </body>
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| 49 | </html> |
| \ | No newline at end of file |