属性只有一个值的这类 html 属性是怎么回事，该如何设置值；比如：checked = “checked” vs checked = true

参考链接：https://stackoverflow.com/questions/10650233/checked-checked-vs-checked-true

问：

1 What is the difference between the below two usages?
2 
3 document.getElementById('myRadio').checked = "checked";
4 and
5 
6 document.getElementById('myRadio').checked = true;
7 For me, both are behaving the same way. But, I am just curious to know why there exist two methods to do the same.
8 
9 Which one will be the ideal usage? I need to support IE7 and higher versions.

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