Xufoxsamccone提出了一个问题：Most efficient way to prepend a value to an array，或许与您遇到的问题类似。
回答者maerics给出了该问题的处理方式：
I'm not sure about more efficient in terms of big-O but certainly using the unshift method is more concise:
var a = [1, 2, 3, 4]; a.unshift(0); a; // => [0, 1, 2, 3, 4]
[Edit]
This jsPerf benchmark shows that unshift is decently faster in at least a couple of browsers, regardless of possibly different big-O performance iff you are ok with modifying the array in-place. If you really can't mutate the original array then you would do something like the below snippet, which doesn't seem to be appreciably faster than your solution:
a.slice().unshift(0); // Use "slice" to avoid mutating "a".
[Edit 2]
For completeness, the following function can be used instead of OP's example prependArray(...) to take advantage of the Array unshift(...) method:
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