偏函数用法(Partial Application)

function apply(f)
{
var args = Array.prototype.slice.call(arguments, 1)
return function(x) {
return f.apply(null, args.concat(x))
}
}
function eq(a, b)
{return a==b;}
[1,2,3,4,5,6,7,8,9].filter(apply(eq, 3));