小编Ben*_*enj的帖子

JavaScript何时评估函数？是在页面加载还是在调用函数时？

我问的原因是因为我有以下代码:

function scriptLoaded() {
   // one of our scripts finished loading, detect which scripts are available:
   var jQuery = window.jQuery;
   var maps = window.google && google.maps;

   if (maps && !requiresGmaps.called) {
     requiresGmaps.called = true;
     requiresGmaps();
   }
   if (jQuery && !requiresJQuery.called) {
     requiresJQuery.called = true;
     requiresJQuery();
   }
   if (maps && jQuery && !requiresBothJQueryGmaps.called) {
     requiresBothJQueryGmaps.called = true;
     requiresBothJQueryGmaps();
   }
}
// asynch download of script
function addScript(url) {
    var script = document.createElement('script');
    script.src = url;
    // older IE...
    script.onreadystatechange=function () …