Chrome调试器中的Scope Local变量中的双冒号是什么意思？

Question

See the screen dump fragment below. Notice that there are two colons between legend and Object (legend is a field of ptd). What does the double colon mean?

My problem is that if I test the value of ptd.legend, it is 'undefined'. Which it shouldn't be...

Answer 1

It means that the property name is actually the string "legend:". You can tell by the syntax highlighting.

For example:

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