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texta = {background:{a:"<span>",b:"</span>"},
color:{a:"<span>",b:"</span>"}
};
var dsadsa="color";
alert(texta.background.a);//正确
alert(texta.dsadsa.a);//错误
texta = {background:{a:"<span>",b:"</span>"},
color:{a:"<span>",b:"</span>"}
};
var dsadsa="color";
alert(texta.background.a);//正确
alert(texta[dsadsa].a);
alert(texta.dsadsa.a);//错误
texta = {background:{a:"<span>",b:"</span>"},
color:{a:"<span>",b:"</span>"}
};
var dsadsa=texta.color;
alert(texta.background.a);//正确
alert(dsadsa.a);//错误