function aa(h)
{
if (h==1)
{document.all.img1.src="images/22.jpg"}
if (h==2)
{document.all.img1.src="images/5.jpg"}
}
</script>
<img src="images/5.jpg" onClick="aa(1)" id="img1">
<img src="images/22.jpg" onClick="aa(2)" id="img2">
var html = '<div class="main">文字文字文字<img src="/upload/123.jpg" /></div>'var reg = /(<div[^>]*class[=\"\']+main[\"\']?[^>]*>(?:(?!<img)[\s\S])*<img[^>]*src[=\"\']+)(\/upload[^\"\']*[\"\']?[^>]*>(?:(?!<\/div>)[\s\S])*<\/div>)/gi
html = html.replace(reg, "$1http://www.abc.com$2")
console.log(html)