- the function parameter may also set default values, when arguments parameter is not passed down the default value
function fn(x=1, y) {
console.log(x,y);//1,undefined
}
fn();
- Extended operator ...
- can be turned into an array of non-array, or array can be turned into an array
[... argument] // array will become an array of classes
... [2]; // array [2] into a digital 1,2
[... ary1, ... ary2]; // array of splicing
a digital string becomes the fastest way "" +1
Function arrow
arrow without this function, the function of the arrow to its parent in the scope of this lookup function ABS (A) {
the console.log (A)
}
// rewritten as a function of an arrow: = function name (parameter) => {}
= ABS (A) => {
the console.log (A)
};
ABS (10)