var hd = document.getElementById("hd");
hd.setAttribute("align", "center");
var hc = document.getElementById("hc");
hc.align = "center";
思考下 hc.align 与 hc.style.textAlign的差别
var hd = document.getElementById("hd");
hd.setAttribute("align", "center");
var hc = document.getElementById("hc");
hc.align = "center";
思考下 hc.align 与 hc.style.textAlign的差别