用Chrome内容脚本扩展替换网站中的文本

Replace text in website with Chrome content script extension

本文关键字:网站 文本 替换 扩展 Chrome 脚本      更新时间:2023-09-26

我想创建谷歌Chrome扩展。它的工作是用所有网站上的一个词替换另一个词。

我有以下舱单。json文件:

{
  "name": "My extension",
  "version": "1.0",
  "background_page": "background.html",
  "permissions": [
    "tabs", "http://*/*"
  ],
  "content_scripts": [
    {
      "matches": ["http://*/*"],
      "js": ["myscript.js"],
      "run_at": "document_end"
    }
  ]
}

和myscript.js中的javascript是:

< script type="text/javascript" >
    document.body.innerHTML = document.body.innerHTML.replace("uno", "dos");
< /script >

然而,这不起作用…我找不到一个方法来调试内容脚本,只有background.html

我以JavaNut13和Matt Curtis的例子为Reddit创建别名隐藏器扩展,并为新的清单2更新了它。它查找Reddit上名为"user1"的用户,并将其替换为"nobody"。根据需要修改

manifest.json

{
  "name": "No Alias",
  "version": "0.1",
  "permissions": [
    "https://www.reddit.com/*"
  ],
  "content_scripts": [
    {
      "matches": ["https://www.reddit.com/*"],
      "js": ["myscript.js"],
      "run_at": "document_end"
    }
  ],
  "manifest_version": 2
}

myscript.js

document.body.innerHTML = document.body.innerHTML.replace(new RegExp("user1", "g"), "nobody");

我实际上是用jQuery写的:(确保你有正确的include标签)

var replaced = $("body").html().replace(/text/g,'replace');
$("body").html(replaced);

在这种规模上替换/更改DOM中的文本不应该使用直接的HTML-regex替换,这是非常不安全的。在此过程中,您可能会破坏HTML。

您需要做的是遍历文档中的每个TextNode (Node),修改其中的文本。

你的代码最终看起来像这样:

var replaceTextInNode = function(parentNode){
    for(var i = parentNode.childNodes.length-1; i >= 0; i--){
        var node = parentNode.childNodes[i];
        //  Make sure this is a text node
        if(node.nodeType == Element.TEXT_NODE){
            node.textContent = /* modify text here */
        } else if(node.nodeType == Element.ELEMENT_NODE){
            //  Check this node's child nodes for text nodes to act on
            replaceTextInNode(node);
        }
    }
};
replaceTextInNode(document.body);

使用DOM,修改相应Text节点的data。例如

document.body.querySelector(".number").firstChild.data = "dos";
var matchText = function(node, regex, callback, excludeElements) { 
    excludeElements || (excludeElements = ['script', 'style', 'iframe', 'canvas', 'a']);
    console.log("Node name " + node.nodeName);
    var child = node.firstChild;
    while (child) 
    {
        switch (child.nodeType) 
        {
        case 1:
            if (excludeElements.indexOf(child.tagName.toLowerCase()) > -1)
                break;
            matchText(child, regex, callback, excludeElements);
            break;
        case 3:
            var bk = 0;
            child.data.replace(regex, function(all) 
            {
                var args = [].slice.call(arguments),
                    offset = args[args.length - 2],
                    newTextNode = child.splitText(offset+bk), tag;
                bk -= child.data.length + all.length;
                newTextNode.data = newTextNode.data.substr(all.length);
                tag = callback.apply(window, [child].concat(args));
                child.parentNode.insertBefore(tag, newTextNode);
                child = newTextNode;
            });
            regex.lastIndex = 0;
            break;
        }
        child = child.nextSibling;
    }
    return node;
};
matchText(document.body, new RegExp("(?:(?:''+|0{0,2})91(''s*[''- ]''s*)?|[0 ]?)?[789]''d{9}|(''d[ -]?){10}''d", "g"), function(node, match, offset) {
    var newAnchor = document.createElement("a");
    newAnchor.className = "search-term";
    //newAnchor.textContent = match;
    newAnchor.href = "tel:" + match.replace( /('s|-)/g, "");
    newAnchor.innerHTML = '<img src =' + chrome.extension.getURL("call_icon_10x10.png")+'> ' + match;
    return newAnchor;
});