A string issue when dealing with Chinese.

[dingdinglz]

When I run this code,I can't get the wanted response.

package main

import (
	"github.com/robertkrimen/otto"
)

func main() {
	vm := otto.New()
	vm.Run(`
	var Message = "发送 213123";
    index = (Message).indexOf(' ') + 1;
	console.log(Message.slice(0,index-1));
	`)
}

I think the correct res is

But I get this

Maybe there are some errors in otto?

I can't sure,so I send this issue.Maybe you can help me.I think it may link to Chinese.

When I replace the "发送" with "send" , I can get the right answer.

Thank you for your help.

[stevenh]

Thanks for the report @dingdinglz could you try #535 to confirm it fixes your use case please.

[dingdinglz]

Thank you for your help.The problem has been corrected.