获取子节点，理论上面是不会返回空的，否则就是某个流程出了问题 @param position adapter实际的item位置

callback after initialization @param statusCode status code from initializing procedure @param msg Message from initializing procedu

* Render Element with child to native

* Trace running information

Reads and returns the Boolean environment variable corresponding to the given flag; if it's not set, returns default_value. The value is considered t

Formats a source file path and a line number as they would appear in an error message from the compiler used to compile this code.

Parses a string for a string flag, in the form of "--flag=value". On success, stores the value of the flag in *value, and returns true. On failure,

Called at the start of streaming to notify the receiver what protocol we are using.

Converts the buffer in a stringstream to an std::string, converting NUL bytes to "\\0" along the way.

Iterates over a vector of TestCases, keeping a running sum of the results of calling a given int-returning method on each. Returns the sum.

* Get the absolute full path * @param {string} path - relative path

listItemView的数量

Returns the current OS stack trace getter if it is not NULL; otherwise, creates an OsStackTraceGetter, makes it the current getter, and returns it.