javascript - What does the double colon mean in Scope Local variables in Chrome's debugger? -

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see screen dump fragment below. notice there 2 colons between legend , object (legend field of ptd). double colon mean?

my problem if test value of ptd.legend, 'undefined'. shouldn't be...

scope local

it means property name string "legend:". can tell syntax highlighting.

for example:

obj['legend:'] = 'value';

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