JavaScript 随机生成 hex色值

rnd_hex:function(){

        var hex = "#"

        for(var i = 0 ; i < 6 ; i++){
               var uni = Math.round(Math.random()*22+48)
                if(uni<58 | uni>64){
                        var chr = String.fromCharCode(uni)
                        hex = hex + chr
                }else{
                        i--
        }
 
        return hex
 
}