Question

我有一个可以在网页生命周期的任何阶段加载的脚本。加载脚本时，它必须运行initialize（）方法。

我希望这个函数在“onload”事件上运行，但我不能确定该页面尚未加载，即“onload”尚未被解雇。

理想情况下，我的脚本看起来像这样：

var _initialize = function() { ...};

if(window.LOADED)
    _initialize();
else if (window.addEventListener)
    window.addEventListener('load', _initialize, false); 
else if (window.attachEvent)
    window.attachEvent('onload', _initialize);

是否有这样的window.LOADED或document.LOADED变量或类似的东西？

提前致谢，沙恩

Answer 1

您可以使用jQuery来执行此操作。 $(document).ready()。查看this

只需在准备好的内部调用您想要的功能。然后它将在文档完全加载后执行

Answer 2

如果您没有使用任何库，则可以使用此

    function somelib(){
        this.readystate = false;    //tracks the state of DOM
        var nextcallfunc;       //stores the function to be called after DOM is loaded

    //called by checkReady function when DOM is loaded completely   
        this.ready = function(func){
          // quit if this function has already been called
          if (arguments.callee.done) return;
          // flag this function so we don't do the same thing twice
          arguments.callee.done = true;
          this.readystate=true;     //make DOM load permanent
          nextcallfunc.call();      //calls the onload handler
    }

    //Checks if the DOM has loaded or not
    this.checkReady= function(func){
        /* for Mozilla/Opera9 */
        nextcallfunc = func;

        if (document.addEventListener) {
          document.addEventListener("DOMContentLoaded", this.ready , false);
        }
        /* for Internet Explorer */
        /*@cc_on @*/
        /*@if (@_win32)
          document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
          var script = document.getElementById("__ie_onload");
          script.onreadystatechange = function() {
            if (this.readyState == "complete") {
              ready(func); // call the onload handler
            }
          };
        /*@end @*/

        /* for Safari */
        if (/WebKit/i.test(navigator.userAgent)) { // sniff
          var _timer = setInterval(function() {
            if (/loaded|complete/.test(document.readyState)) {
              this.ready(); // call the onload handler
            }
          }, 10);
        }

        /* for other browsers */
        window.onload = this.ready;
    }

    }

这也解决了跨浏览器问题..

Answer 3

这就是我所做的（用CoffeeScript编写）：

$(window).on 'load', ->
  window._loaded = true

window.on_window_load_safe = (callback) ->
  if window._loaded
    # Since the load even already happened, if we tried to add a new callback now, it would not even
    # get called. So just call the callback immediately now.
    callback.call()
  else
    $(window).on 'load', ->
      callback.call()

您可以使用以下内容进行测试：

  setTimeout(->
    on_window_load_safe ->
      console.debug 'on_window_load_safe called me'
  , 2000)

Answer 4

你可以使用

jQuery(document).ready();

在页面的末尾或标签之前，它会在您的网页显示在客户端计算机上时大约在加载结束时显示.....

Javascript：检测窗口何时完全加载

4 个答案: