Create Mathematical Validation in Phone

create input, box and operation div in the html file.

<div id="operation"></div><input id="ans" type="text" /><input id="validate_btn" type="button" value="check" />

write below code in the js file.

var answer;

var method = ['+', '-', '*'];
var operation;
//var operation='1+2+3';

// load new operation on page laod
new_operation();