if( a === undefined){}
转化为
if(void 0 === a){}
[...document.querySelectorAll('div')]
转化为
[].contact(_toConsumableArray(document.querySelectorAll('div')));
let {x,y,..z} = {x:1,y:2,a:3,b:4}
转化为
var _x$y$a$b = {x:1,y:2,a:3,b:4}
x = _x$y$a$b.x
y = _x$y$a$b.y
z = _objectWithoutProperties(_x$y$a$b,["x","y"]);
const a = [1,2]
a.push(...[3,4,5])
转化为
a.push.apply(a,[3,4,5])