[R] how to randomize a vector

[leffgh]

I have a vector whose length is nearly 70 thousand.
I need randomize it for 1000 times .
for randomizing , I mean ,the elements of the vector remain intact while
their order in the vector get changed randomly.
I have written a function which seems to be able to solve short vectors ,
but waste  a lot of time when dealing with the the long vector mentioned
above.
 
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