t.setTextBaseline is not a function.

(In 't.setTextBaseline("bottom")', 't.setTextBaseline' is undefined);

at pages/index onLoad function;at api request success callback function

今天出现好多这个error，版本主要是6.5.7和6.5.8，没太看懂是个啥意思，谁能解答一下？