function A() {
    this.do1 = function () {
        console.log(1);
    };
    this.do2 = function () {
        console.log(2);
    };
}

var a = new A();
var keys = Object.keys(a);
for(var i=0;i<keys.length;i++){
    if(typeof a[keys[i]] ==="function"){
        a[keys[i].toUpperCase()] = a[keys[i]];
        delete a[keys[i]];
    }
}

a["DO1"](); //1