js正则替换html怎么写？_随笔

var str = "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">"

str = str.replace(/^[<!DOCTYPE html].*[>]$/,"<!DOCTYPE html>")

alert(str)

var s="<span>a</span>.... <span&gtz</span>"

s=s.replace(/<span>(.*?)<\/span>/g,"<input type='text' value='$1' />")

<!DOCTYPE HTML>

<html>

<head>

<title>Page Title</title>

onload = function (){

var html = document.body.innerHTML

var reg = /(<img(?:(?!id|>).)*)(id[\=\"\'\s]+)?([^\"\'\s]*)([\"\']?)([^>]*>)/gi

var idx = 0

html = html.replace(reg, function($0, $1, $2, $3, $4, $5){

idx++

if(typeof $2 == "undefined"){

return $1 + " id='" + idx + "'" + $3 + $4 + $5

}

return $1 + $2 + idx + $4 + $5

})

document.body.innerHTML = html

}

</script>

</head>

<body>

<ul>

</ul>

</body>

</html>

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js正则替换html怎么写？