哈哈找到一个能动态加载js的方法

哈哈找到一个能动态加载js的方法

//加载新的js
function _GetJsData(url, callback) {
    var scripts = document.createElement("script");
    document.body.appendChild(scripts);

    scripts.onload = function() {
        callback();
        document.body.removeChild(this);
    };
    scripts.onreadystatechange = function() {
        if (this.readyState == "loaded") {
            callback();
            document.body.removeChild(this);
        }
    };
    scripts.charset = "GBK";
    scripts.src = url;
}
_GetJsData('http://www.uefirst.com/index.js',isok);
var isok=function(){alert('isok')};

http://www.uefirst.com/bbs/read-htm-tid-22.html

同一域下的js，还有一个方法
XHR 获取js文本，然后eval~
这样是同步的。~ 不需要callback

我是需要callback的,比如url是个json数据
但是你的方法来段代码看看呗....

你说的是不是这种:
http://www.uefirst.com/bbs/read-htm-tid-50.html
jsonp的

http://www.sencha.com/forum/showthread.php?60350-Ext.ux.OnDemandLoad-Dynamic-load-js-file-and-invoke-the-method-in-it

这种onload是dom规范里面的吗？浏览器支持情况如何啊？？

http://images.39.net/js/google/google_730_ask.js  似乎这个没办法加载

jquery、prototype 等之类的框架几年前就已经有了...~ 去看看源码吧...

callback就直接是载入的JS文本啦，可以看看高性能Javascript这本书

Jquery 1.4源码：

var head = document.getElementsByTagName("head")[0] ||        
                             document.documentElement;
    var script = document.createElement("script");
    script.src = s.url;
    // Handle Script loading
    // Attach handlers for all browsers
    script.onload = script.onreadystatechange = function() {
         if ( !done && (!this.readyState ||
                     this.readyState === "loaded" || this.readyState === "complete") ) {
             done = true;
             jQuery.handleSuccess( s, xhr, status, data );
             jQuery.handleComplete( s, xhr, status, data );
             // Handle memory leak in IE
             script.onload = script.onreadystatechange = null;
             if ( head && script.parentNode ) {
                 head.removeChild( script );
              }
           }
        };
 }
// Use insertBefore instead of appendChild to circumvent an IE6 bug.
 // This arises when a base node is used (#2709 and #4378).
 head.insertBefore( script, head.firstChild );
 // We handle everything using the script element injection
return undefined;