JavaScript递归问题
function moveElement(elementID,final_x,final_y,interval){
if (!document.getElementById) return false;
if (!document.getElementById(elementID)) return false;
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);
}
最后的递归调用语句(var repeat = "moveElemen('"+elementID+"',"+final_x+","+final_y+","+interval+")";)
这里的+号起什么作用?单引号与双引号又有什么用?!
本菜鸟研究了N久还是搞不明白,请各位大侠耐心指教,谢谢!!!!!(JS初哥,分不多)