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return json from javascript function issue

i am tring to return custom json object from javascript function my code is as below

Fiddle

html 

<input type='checkbox' name='chk[]' value='1'>1
<input type='checkbox' name='chk[]' value='2'>2
<input type='text' id='txt' value='' />
<input id='btn' type='button' value='click' />​

js

var json = {};
$('#btn').click(function(){
 console.log(getdata());
});
function getdata(){
 $('input:checked').each(function(i){
 json.chk = $(this).val();
 //json.chk.push({"val": $(this).val()}); gives error Uncaught TypeError: Cannot call method 'push' of undefined
 });
 json.txt = document.getElementById("txt").value;
 return json;
}

​ i need result like below 

{
 chk: [{val: 1}, {val: 2}],
 txt: 'test'
};

Answer*

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lang-js

AltStyle によって変換されたページ (->オリジナル) /