运行一个星期前升至更久前的脚本，，，出现如下错误提示
elementNotVisibleException was unhandled by user code。
经过询问大侠，说我的脚本不够健全，也就是稳定性的问题，需要增加一些判断等待，那需要封装一些等待方法
public
static
void
WaitUnit<T>(
this
IWebDriver webDriver, Func<IWebDriver, T> func,
int
seconds =
20
)
{
var
wait =
new
WebDriverWait(webDriver, TimeSpan.FromSeconds(seconds));
wait.Until(func);
}
///
<summary>
///
强制让webdriver等待，直到给定的元素(by)存在于DOM之中
///
</summary>
public
static
void
WaitElementExist(
this
IWebDriver webDriver, By by,
int
seconds =
20
)
{
var
wait =
new
WebDriverWait(webDriver, TimeSpan.FromSeconds(seconds));
wait.Until(ExpectedConditions.ElementExists(by));
}
///
<summary>
///
强制让webdriver等待，直到给定的元素(by)的CSS属性visiblity的值为visible
///
</summary>
public
static
void
WaitElementVisible(
this
IWebDriver webDriver, By by,
int
seconds =
20
)
{
var
wait =
new
WebDriverWait(webDriver, TimeSpan.FromSeconds(seconds));
wait.Until(ExpectedConditions.ElementIsVisible(by));
}
///
<summary>
///
强制让webdriver等待，直到当前的浏览器title包含指定的字符串
///
</summary>
public
static
void
WaitTitleContains(
this
IWebDriver webDriver,
string
title,
int
seconds =
20
)
{
var
wait =
new
WebDriverWait(webDriver, TimeSpan.FromSeconds(seconds));
wait.Until(ExpectedConditions.TitleContains(title));
}
///
<summary>
///
强制让webdriver等待，直到当前的浏览器title与给定读的title一致
///
</summary>
public
static
void
WaitTitleIs(
this
IWebDriver webDriver,
string
title,
int
seconds =
20
)
{
var
wait =
new
WebDriverWait(webDriver, TimeSpan.FromSeconds(seconds));
wait.Until(ExpectedConditions.TitleIs(title));
}
///
<summary>
///
Executes JavaScript in the context of the currently selected frame or window.
///
</summary>
///
<param name="webDriver">
IWebDriver实例
</param>
///
<param name="jsCode">
js代码(最好的web里面先执行一次，确保正确性)
</param>
public
static
void
ExecJavascript(
this
IWebDriver webDriver,
string
jsCode)
{
((IJavaScriptExecutor)webDriver).ExecuteScript(jsCode);
}
