javascript的调用function的问题

Question

请问这段代码中var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";的+是什么用法？function moveElement(elementID,final_x,final_y,interval){var elem = document.getElementById(elementID);var xpos = parseInt(elem.style.left);var ypos = parseInt(elem.style.top);if(xpos == final_x && ypos == final_y){return true;}if(xpos < final_x){xpos++;}if(xpos > final_x){xpos--;}if(ypos > final_y){ypos--;}if(ypos < final_y){ypos++;}elem.style.left = xpos + "px";elem.style.top = ypos + "px";var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";movement = setTimeout(repeat,interval);}

Answer 1

<script language="javascript"> setup(); </script> 方法名就可以了。不过这样调用最好是放在页面的最下面。 也就是</body>结束的地方