def evaluate_js(script, uid='master'):
"""
Evaluate given JavaScript code and return the result
:param script: The JavaScript code to be evaluated
:param uid: uid of the target instance
:return: Return value of the evaluated code
"""
escaped_script = 'JSON.stringify(eval("{0}"))'.format(escape_string(script))
return gui.evaluate_js(escaped_script, uid)
def load_css(stylesheet, uid='master'):
code = css.src % stylesheet.replace('\n', '').replace('\r', '').replace(
'"', "'")
gui.evaluate_js(code, uid)