javascript - how can i automatically calculate an expression from a text field -

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how can automatically calculate expression text field .. there function or thing ..

 <input type="text" value="3+4" id="txt">      var result = function_in_javascript(document.getelementbyid("txt").value)      alert(result )// 7

try eval(document.getelementbyid("txt").value)

edit: though?


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