我发现将DOM搜索限制为当前模板而不是document是一种很好的模式，因此我开始将所有document.querySelector()替换为template.find()和jquery {{ 1}} $(selector)。
内部活动一切都很好，但是在这段代码（template.$(selector)）中，它只是不起作用，我在控制台中得到：onRendered：
TypeError: undefined is not an object (evaluating 'template.$')有谁知道发生了什么？
答案 0 :(得分：2)
内部生命周期事件回调，例如public Bitmap getDetectedImage()
{
int rx, rx, lx, ly, ...;
double dRightLeft = 0;
...
//righteyeloop
for (int x = fo.rightEye.X; x < (fo.rightEye.X + fo.rightEye.Width); x++)
{
for (int y = fo.rightEye.Y; y < (fo.rightEye.Y + fo.rightEye.Height); y++)
{ //segmentation...//
rPixel++;
result.byteImage[x, y].R = 0;
result.byteImage[x, y].G = 255;
result.byteImage[x, y].B = 0;
//to get the the first pixel detected//
if (rPixel == 1)
{
result.byteImage[x, y].R = 255;
result.byteImage[x, y].G = 0;
result.byteImage[x, y].B = 0;
rx = x + (fo.rightEye.Width / setting.featureWidth * setting.eyeHeight / setting.eyeWidth);
ry = y + (fo.rightEye.Height / setting.featureWidth * setting.eyeHeight / setting.eyeWidth);
}
}
}
//lefteyeloop basically the same type as righteyeloop//
.....
//this to count the distance of righteye and lefteye
double rl = ((rx - lx) * (rx - lx) + (ry - ly) * (ry - ly));
double dRightLeft = Math.Pow(rl, 0.5);
}
，onCreated和onRendered，当前模板实例绑定到onDestroyed关键字。
简单地用this替换template（在此上下文中未定义）{/ 1}：
this