jQuery实现本地预览上传图片功能

objPre.style.height = zoomParam.height + 'px';
objPre.style.marginTop = zoomParam.top + 'px';
objPre.style.marginLeft = zoomParam.left + 'px';
}

function clacImgZoomParam( maxWidth, maxHeight, width, height ){
var param = { width:width, height:height, top:0, left:0 };

if( width>maxWidth || height>maxHeight ){
rateWidth = width / maxWidth;
rateHeight = height / maxHeight;

if( rateWidth > rateHeight ){
param.width = maxWidth;
param.height = height / rateWidth;
}else{
param.width = width / rateHeight;
param.height = maxHeight;
}
}

param.left = (maxWidth - param.width) / 2;
param.top = (maxHeight - param.height) / 2;

return param;
}
</script>

<input name="localfile" type="file" id="localfile" size="28" onchange="onUploadImgChange(this)"/>

<!--以下是预览图片用的-->
<div id="preview_wrapper">
<div id="preview_fake">
<img id="preview" src="" onload="onPreviewLoad(this)"/>
</div>
</div>
<br/>
<img id="preview_size_fake" />