(转)异步返回数据中的脚本运行

在日常的使用中，不可避免的在异步的返回数据中需要运行脚本，而将返回数据直接写入页面中的某个容器中，脚本是不会运行的
下面举个例子，异步返回的数据：

<div id="test">...</div>
<script type="text/javascript">
alert('test');
</script>
<div id="test2">..</div>
<script type="text/javascript">
alert('test2');
</script>

异步操作的代码(以jquery代码为例)：

$.get('test.php', function(data){
    $('#container').html(data);
})

这样实现的话，异步中的数据会写入到container容器中，但两个script标签中的脚本不会运行，下面说一下解决方案：
1. 将返回的数据以script标签分割开
2. 将含有dom元素的文本分批加入到指定容器中，加入后将文本之间的脚本添加到header中运行(注:添加的过程中，各段需要延迟运行，因为脚本的运行需要时间，延迟的时间以脚本中时间最长的为准)
3. 脚本运行完成后将添加到header中的脚本移出
以下为网上的一段实现代码:

var global_html_pool = [];
var global_script_pool = [];
var global_script_src_pool = [];
var global_lock_pool = [];
var innerhtml_lock = null;
var document_buffer = "";
function set_innerHTML(obj_id, html, time) {
    if (innerhtml_lock == null) {
        innerhtml_lock = obj_id;
    }
    else if (typeof(time) == "undefined") {
        global_lock_pool[obj_id + "_html"] = html;
        window.setTimeout("set_innerHTML('" + obj_id + "', global_lock_pool['" + obj_id + "_html']);", 10);
        return;
    }
    else if (innerhtml_lock != obj_id) {
        global_lock_pool[obj_id + "_html"] = html;
        window.setTimeout("set_innerHTML('" + obj_id + "', global_lock_pool['" + obj_id + "_html'], " + time + ");", 10);
        return;
    }
    function get_script_id() {
        return "script_" + (new Date()).getTime().toString(36)
          + Math.floor(Math.random() * 100000000).toString(36);
    }
    document_buffer = "";
    document.write = function (str) {
        document_buffer += str;
    }
    document.writeln = function (str) {
        document_buffer += str + "\n";
    }
    global_html_pool = [];
    var scripts = [];
    html = html.split(/<\/script>/i);
    for (var i = 0; i < html.length; i++) {
        global_html_pool[i] = html[i].replace(/<script[\s\S]*$/ig, "");
        scripts[i] = {text: '', src: '' };
        scripts[i].text = html[i].substr(global_html_pool[i].length);
        scripts[i].src = scripts[i].text.substr(0, scripts[i].text.indexOf('>') + 1);
        scripts[i].src = scripts[i].src.match(/src\s*=\s*(\"([^\"]*)\"|\'([^\']*)\'|([^\s]*)[\s>])/i);
        if (scripts[i].src) {
            if (scripts[i].src[2]) {
                scripts[i].src = scripts[i].src[2];
            }
            else if (scripts[i].src[3]) {
                scripts[i].src = scripts[i].src[3];
            }
            else if (scripts[i].src[4]) {
                scripts[i].src = scripts[i].src[4];
            }
            else {
                scripts[i].src = "";
            }
            scripts[i].text = "";
        }
        else {
            scripts[i].src = "";
            scripts[i].text = scripts[i].text.substr(scripts[i].text.indexOf('>') + 1);
            scripts[i].text = scripts[i].text.replace(/^\s*<\!--\s*/g, "");
        }
    }
    var s;
    if (typeof(time) == "undefined") {
        s = 0;
    }
    else {
        s = time;
    }
    var script, add_script, remove_script;
    for (var i = 0; i < scripts.length; i++) {
        var add_html = "document_buffer += global_html_pool[" + i + "];\n";
        add_html += "document.getElementById('" + obj_id + "').innerHTML = document_buffer;\n";
        script = document.createElement("script");
        if (scripts[i].src) {
            script.src = scripts[i].src;
            if (typeof(global_script_src_pool[script.src]) == "undefined") {
                global_script_src_pool[script.src] = true;
            }
        }
        else {
            script.text = scripts[i].text;
        }
        s += 500;
        script.defer = true;
        script.type =  "text/javascript";
        script.id = get_script_id();
        global_script_pool[script.id] = script;
        add_script = add_html;
        add_script += "document.getElementsByTagName('head').item(0).appendChild(global_script_pool['" + script.id + "']);\n";
        window.setTimeout(add_script, s);
        remove_script = "document.getElementsByTagName('head').item(0).removeChild(document.getElementById('" + script.id + "'));\n";
        remove_script += "delete global_script_pool['" + script.id + "'];\n";
        window.setTimeout(remove_script, s + 20000);
    }
    var end_script = "if (document_buffer.match(/<\\/script>/i)) {\n";
    end_script += "set_innerHTML('" + obj_id + "', document_buffer, " + s + ");\n";
    end_script += "}\n";
    end_script += "else {\n";
    end_script += "document.getElementById('" + obj_id + "').innerHTML = document_buffer;\n";
    end_script += "innerhtml_lock = null;\n";
    end_script += "}";
    window.setTimeout(end_script, s);
}