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2017version

support: IE8+

targetElement.insertAdjacentElement(position, element);

'beforebegin': Before the element itself.
'afterbegin' : Just inside the element, before its first child.
'beforeend' : Just inside the element, after its last child.
'afterend' : After the element itself.

Before

function prependChild(parentEle, newFirstChildEle) {
    parentEle.insertBefore(newFirstChildEle, parentEle.firstChild)
}