javascript - What is the error in .catch inside webcam.js file -

in application using webcam. access used webcam.js (https://pixlcore.com/). when opened in eclipse shows error as:syntax error on token "catch", identifier expected. little code snippet:

            var self = this;             this.mediadevices.getusermedia({                 "audio": false,                 "video": this.params.constraints || {                     mandatory: {                         minwidth: this.params.dest_width,                         minheight: this.params.dest_height                     }                 }             })             .then( function(stream) {                 // got access, attach stream video                 video.src = window.url.createobjecturl( stream ) || stream;                 self.stream = stream;                 self.loaded = true;                 self.live = true;                 self.dispatch('load');                 self.dispatch('live');                 self.flip();             })             .catch( function(err) {  //here shows error                 return self.dispatch('error', "could not access webcam: " + err.name + ": " + err.message, err);             }); 

what reason , how resolve it?

the problem apparently catch reserved keyword, , code-checker thinks error. however, code checker mistaken, , catch valid method call. is, unless older version if ie.

in older versions of ie, code fail because had issue assumed catch outside of try/catch invalid. believe issue fixed in either ie9 or ie10, not sure.

anyhow, can work around issue both old ie , other things general issue using catch in string bracket property access:

// ... .then( function(stream) {     // ... }) ['catch']( function(err) {      // ... });