How does Jquery implement numerical addition and change the corresponding numerical style according to the remainder (code)

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Jquery content

html content

 
 请编写javascript代码，完成如下功能要求：
 
 
 计算下面文本框中数字之和  
 
 点我将所有文本框中数字之和，对9求余数，将数字等于余数的文本框前景色改为红色  
 
 
 
          
 

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