JavaScript调用后台的三种方法实例_javascript技巧

public static string BehindMethod()
{
return "这是一个后台的方法";
}

[System.Web.Services.WebMethod]
public static string GetImg(string ext)
{
System.Threading.Thread.Sleep(5000);//为了有点等待的效果，延迟5秒
StringComparer sc = StringComparer.OrdinalIgnoreCase;
string[] extArr = new string[] { "php", "asp", "aspx", "txt", "bmp" };
bool f = extArr.Any(s=>sc.Equals(s,ext)); //判断传入的后缀名是否存在

if (f)
{
return "image/54222860.jpg";
}
return "image/star1.jpg";
}

protected void Page_Load(object sender, EventArgs e)
{
AjaxPro.Utility.RegisterTypeForAjax(typeof(AjaxDemo)); //注册
}

[AjaxPro.AjaxMethod]
public string GetImgByAjaxPro()
{
return "image/54222860.jpg";
}

function GetMethodByAjaxPro() {
var a = JustTest.AjaxDemo.GetImgByAjaxPro();//JustTest是当前的名字空间，AjaxDemo表示后台类
document.getElementById("imgAjaxPro").src = a.value;
}