js中confirm提示三个按钮“是”“否”“取消” 重载DOM中confirm window.confirm = function(str) {   str=str.replace(/\'/g, "'&chr(39)&'").replace(/\r\n|\n|\r/g, "'&VBCrLf&'");   execScript("n = msgbox('"+ str +"', 3, '提示')"