class Demo {
double param1;
double param2 = 2;
double param3 = 3;
Demo(this.param1, {this.param2, this.param3}); //這么設(shè)置默認(rèn)參數(shù)值無(wú)效贸街？
Demo.fun(double param1,
{double param2 = 22, double param3 = 3}) {
this.iconData = iconData;
this.color = color;
this.size = size;
}
}
剛開(kāi)始學(xué)習(xí)dart，想問(wèn)一下各位大佬茅姜，第一種構(gòu)造方式是從網(wǎng)上看的闪朱，為什么不能生效呢
