功能默认值输入

Question

i'm testing my website and everything is worked as wished, but when i work on ipad using safari i got this error:

Unexpected token '='. Expected a ')' or a ',' after a parameter declaration

This the line of my code where give me the error:

function searchLente(side = null) {

The problem is that when i test my website on a desktop is working (chrome, safari...) But not on ipad...

PD: My ipad is updated at last version.

Answer 1

Default values are a ES6 thingy, and most browsers don't support them.

Change it to

function searchLente(side) {
    side = side === (void 0) ? null : side;

void 0 is a way to tell undefined . This code will check if size is undefined and then set size to a default value ( null ) if is true.

NOTE: This is what typescript actually does when transpiling to ES5 (which don't has defaults).

NOTE2: Don't think that your users will have ES6 enabled, as there are still browsers which don't support it. Use Babel if you want to write ES6 code and make it work for most browsers, or simply don't write ES6 code.