Didn't really found a solution to this for Javascript. What I need; I want to insert an element into an array, but not really overwrite that element. Rather a 'dynamic' insert. Thus Insert element, then shift all elements underneath it by +1 index.Didn't really found a solution to this for Java
阅读背景：
Javascript（动态）插入到数组中，然后将所有元素移到+1下面
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