JavaScript-Questions about Array.prototype.slice.call and Array.prototype.concat.call

Trying to convert a collection of Dom from a getelementsbytagname to a real array, a bit confusing for their results (unlike their own expectations), the test code is as follows
Http://runjs.cn/code/i517birf

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Trying to convert a collection of Dom from a getelementsbytagname to a real array, a bit confusing for their results (unlike their own expectations), the test code is as follows
Http://runjs.cn/code/i517birf

Concat If all subsequent arguments are arrays (including this), the link array is returned as a new array, and the variables are simply formed into an array.
Splice to delete some items in this, and the return value of Getelementbytagname is read-only and cannot be deleted.
Http://zonxin.github.io/post/2015/07/javascript-array-prototype

Concat is a parameter, so it is

Array.prototype.concat.call(aLi, [])

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