<html> <head> <script language="javascript"> function getCursortPosition (ctrl) {//获取光标位置函数 var CaretPos = 0; // IE Support if (document.selection) { ctrl.focus (); var Sel = document.selection.createRange (); Sel.moveStart ('c…
function square(num){ var total = num*num;//局部变量 return total;}var total = 50;//全局变量var number = square(20);alert(total);//结果为50 function square(num){ total = num*num;//全局变量 return total;}var total = 50;//全局变量var number = square(20);alert…