javascript - Why error occured when remove some lines of code? -



javascript - Why error occured when remove some lines of code? -

the next code working expected

class="snippet-code-js lang-js prettyprint-override">obj = { go: function() { alert(this) } } obj.go(); // object (obj.go)(); // object (a = obj.go)(); // window (0 || obj.go)(); // window

but why error occurred when comment origin 2 lines?

class="snippet-code-js lang-js prettyprint-override">obj = { go: function() { alert(this) } } //obj.go(); // commented line //(obj.go)(); // commented line (a = obj.go)(); // window (0 || obj.go)(); // window

i didn't alter of code above, comment 2 lines separate others, browser gives me error information? please clarify me? many thanks.

you have ( after } trying phone call result of evaluating block if function.

before that, however, trying evaluate a = obj.go can passed argument.

since obj hasn't been defined yet (because result of calling "function" hasn't been passed obj), throws error.

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