我遵循由j08691 here給出的代碼。 它工作完美,我嘗試了五個畫布元素,但由於我是JavaScript初學者,所以請幫助我,但在JavaScript中出錯。 var icon =new Array("icon1","icon2","icon3","icon4","icon5");
var c = new Array();
var ctx = new Array(5);
var img
如何在派生類轉換爲其派生類後使用派生類的方法。 public class BaseClass
{
public virtual void DoSomething()
{
Trace.Write("base class");
}
}
public class DerivedClass : BaseClass
{
public overrid
這樣的代碼之後: $stmt = $mysqli->prepare("SELECT District FROM City WHERE Name=?")) {
$stmt->bind_param("s", $city);
$stmt->execute();
$stmt->bind_result($district);
$stmt->fetch();
printf("%s is in dis