jscript: Added implementation of Math_pow with less then 2 arguments.

dlls/jscript/math.c

@@ -441,8 +441,8 @@ static HRESULT Math_pow(DispatchEx *dispex, LCID lcid, WORD flags, DISPPARAMS *d
     TRACE("\n");
 
     if(arg_cnt(dp) < 2) {
-        FIXME("unimplemented arg_cnt %d\n", arg_cnt(dp));
-        return E_NOTIMPL;
+        if(retv) num_set_nan(retv);
+        return S_OK;
     }
 
     hres = to_number(dispex->ctx, get_arg(dp, 0), ei, &x);

dlls/jscript/tests/api.js

@@ -618,6 +618,12 @@ ok(tmp === 2, "Math.pow(2, 2) = " + tmp);
 tmp = Math.pow(2, 2, 3);
 ok(tmp === 4, "Math.pow(2, 2, 3) = " + tmp);
 
+tmp = Math.pow(2);
+ok(isNaN(tmp), "Math.pow(2) is not NaN");
+
+tmp = Math.pow();
+ok(isNaN(tmp), "Math.pow() is not NaN");
+
 tmp = Math.random();
 ok(typeof(tmp) == "number", "typeof(tmp) = " + typeof(tmp));
 ok(0 <= tmp && tmp <= 1, "Math.random() = " + tmp);