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// Byid

Sab. Register ('dom. byid', function ($ ){ Return function (ID ){ If (typeof id = 'string '){ Return document. getelementbyid (ID ); } Else { Return ID; } }; }); // Byclass Sab. Register ('dom. byclass', function ($ ){ Return function (clz, El, TG ){ El = El | document; El = typeof El = 'string '? $. Dom. byid (EL): El; Tg = Tg | '*'; VaR rs = []; Clz = "" + clz + ""; VaR cldr = El. getelementsbytagname (TG), Len = cldr. length; For (VAR I = 0; I <Len; ++ I ){ VaR o = cldr [I]; If (O. nodetype = 1 ){ VaR ECL = "" + O. classname + ""; If (ECL. indexof (clz )! =-1 ){ RS [RS. Length] = O; } } } Return Rs; }; }); At least determine whether or notThe getelementsbyclassname function is a luxury.