JS 实现图片直接下载示例代码

<a href="picName.jpg" id=pic1 onclick="savepic();return false;" style="cursor:hand">点击下载</a>

<script type="text/javascript"> 
function savepic() { 
if (document.all.a1 == null) { 
objIframe = document.createElement("IFRAME"); 
document.body.insertBefore(objIframe); 
objIframe.outerHTML = "<iframe name=a1 style='width:400px;hieght:300px' src=" + imageName.href + "></iframe>"; 
re = setTimeout("savepic()", 1) 
} 
else { 
clearTimeout(re) 
pic = window.open(imageName.href, "a1") 
pic.document.execCommand("SaveAs") 
document.all.a1.removeNode(true) 
} 
} 
</script>