By using JS, it is possible to get a page source, and then respond users with this getting page

I want to implement the following things by using JavaScript:

1. usin开发者_开发知识库g AJAX to get a page source;
2. put in some data into this page source;
3. show the changed page to users.

So it is possible? If so, how?

By the way, I cannot use server side technologies. And if JS is not suitable for it, what client technologies can be used in this case?

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Assuming that the page you are wanting to get source from is on the same domain, you can get the page source like this:

if("XMLHttpRequest" in window){
  xmlhttp=new XMLHttpRequest();
}
if("ActiveXObject" in window){
  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
}
xmlhttp.open('GET', "URLofFileYouWantToGetTheSourceFrom", true);
xmlhttp.onreadystatechange = function() {
  if (xmlhttp.readyState==4) {
    alert(xmlhttp.responseText);
  }
};
xmlhttp.send(null);