DOM,使用可变的字体大小

Question

我试图用变量操纵font-size,但它不起作用.任何人都可以看到有什么问题吗？

http://jsfiddle.net/yRLN3/2/

<div id = "letter">
    <span>A</span>
     <span>l</span>
     <span>p</span>
     <span>h</span>
     <span>a</span>
     <span>b</span>
     <span>e</span>
     <span>t</span>
     <div>

var list = document.getElementsByTagName("span");
var size = 20;
for (i=0; i<list.length; i++) {
    size+=5;
    list[i].style.fontSize = "sizepx";
    };
alert(list.length);

Answer 1

一个小错字:

list[i].style.fontSize = size + "px";

小提琴