javascript - How do I detect whether a position is at the beginning of a line in a textarea? -

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i have textarea this:

<textarea> test1 , test2 plus test3 </textarea>

as see, positions in beginning of line: 0 (t), 14 (a), 32 (p).

now need determine whether position (i mean number of position) @ beginning of line?

for example:

10 : false 5  : false 14 : true 40 : false

how can that?

if want know n-th position @ beginning, then:

n == 0 || $("#textbox").val()[n-1] == '\n'

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