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var arr1 = [ "aaa", "bbb", "ccc" ];
$.each(arr1, function(i,val){
alert(i);
alert(val);
});<br><br>
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var obj = { one:1, two:2, three:3};
$.each(obj, function(key, val) {
alert(key);
alert(val);
});<br><br>
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<input name="aaa" type="hidden" value="111" />
<input name="bbb" type="hidden" value="222" />
<input name="ccc" type="hidden" value="333" />
<input name="ddd" type="hidden" value="444"/>
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$.each($("input:hidden"), function(i,val){
alert(val);
alert(i);
alert(val.name);
alert(val.value);
});<br><br><br><br>