Thanks a lot :)
clearfy a lot now, still noticed in some codes, such as base2.js, when
there is a node reference variable. we can do it like this:
function getNode() {
var node = ..; // get a HTMLElement reference.
// do some thing, e.g, bind event etc,.
// then we can destroy it as (but may be just need it in IE):
try {
return node;
} finally { node = null; }
}
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