Remove the Operator Signs in textbox [closed]

I’m creating a calculator using the JS, I created buttons so it will concatenate the numbers before clicking the operators. I want to use the eval() funtion to compute the numbers in the textbox but the Operator signs must not be displayed in the textbox. So instead of 2 +1 the result in the textbox will be 2 >>operator button clicked >> 1 then the result would be 3 Any Help? Thanks

<div class = btnDiv1>               
                <button onclick="view('7')">7</button>
                <button onclick="view('8')">8</button>
                <button onclick="view('9')">9</button>
                <button onclick="viewOp('*')">X</button>
                <button onclick="btnClear('')">C</button>
                <br>

                <button onclick="view('4')">4</button>  
                <button onclick="view('5')">5</button>
                <button onclick="view('6')">6</button>
                <button onclick="viewOp('/')">/</button>
                <button onclick="view('')">H</button>
                <br>

                <!-- Create another div so align equal sign buttons -->     
                <div class=btnDiv2>
                    <button onclick="view('1')">1</button>
                    <button onclick="view('2')">2</button>
                    <button onclick="view('3')">3</button>
                    <button onclick="viewOp('-')">-</button>
                    <button onclick="Compute(' ')" class = "btnCmp">=</button>
                    <br>

                    <button onclick="viewNegate('')">+/-</button>
                    <button onclick="view('0')">0</button>
                    <button onclick="view('.')">.</button>
                    <button onclick="viewOp('+')">+</button>
                    <br>                    
                </div>          
            </div>

Javascript
// passed the value of the clicked button
function view(num)
{   
    document.getElementById("txtResult").value+= num;
}