JS implements simple four arithmetic operations

This time I will bring you JSimplementation of simple four arithmetic operations, JS implementation of simple four arithmetic operationsWhat are the precautions, the following are Let’s take a look at practical cases.

The specific code is as follows:

<table class="tab">
    <tbody>
        <tr class="tr2">   
            <td colspan="4">
                简易计算器
            </td>
        </tr> 
        <tr class="tr">             
            <td id="result" colspan="4">                
            </td> 
        </tr> 
        <tr>             
            <td id="+" class="tr1">
                +
            </td> 
            <td id="-" class="tr1">
                -
            </td> 
            <td id="*" class="tr1">
                *
            </td> 
            <td id="/" class="tr1">
                /
            </td> 
        </tr> 
        <tr>            
            <td id="7" class="tr1">
                7
            </td>
            <td id="8" class="tr1">
                8
            </td>
            <td id="9" class="tr1">
                9
            </td>
            <td id="0" class="tr1">
                0
            </td>
        </tr>
        <tr>            
          <td id="4" class="tr1">
                4
            </td> 
            <td id="5" class="tr1">
                5
            </td> 
            <td id="6" class="tr1">
                6
            </td> 
            <td id="." class="tr1">
                .
            </td> 
        </tr> 
        <tr>             
            <td id="1" class="tr1">
                1
            </td> 
            <td id="2" class="tr1">
                2
            </td> 
            <td id="3" class="tr1">
                3
            </td> 
            <td id="=" class="tr1">
                =
            </td> 
        </tr>
    </tbody>
</table>

Simple calculator
	-	*	/
7	8	9	0
4	5	6	.
1	2	3	=

For this program, the order of judgment is very important, otherwise the " " number will be stored in s2 and s4 instead of s3.

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