问题
Is there a more performant way to write this.
$('#test').find('option:selected[value!=""]')
回答1:
You can tweak it at little, but using methods instead of Sizzle:
$('#test').find('option').filter(function() {
return this.selected && this.value.length
});
Benchmark: http://jsperf.com/sizzle-vs-methods-filter/12
.filter() is about 70% faster for me.
回答2:
Well, there will always only be one selected, so you don't need a find() handler in my opinion.
I'll just write it like this:
$('#test option:selected[value!=""]')
I haven't tested it yet.
来源：https://stackoverflow.com/questions/4930946/jquery-selector-performance