JavaScrip实现计算器

xiaoxiao2021-02-28 53

<!DOCTYPE html> <html> <head> <title>计算器</title> <script type="text/javascript"> function count(){ //获取第一个输入框的值 var txt1Value = parseInt(document.getElementById("txt1").value); //获取第二个输入框的值 var txt2Value = parseInt(document.getElementById("txt2").value); //获取选择框的值 var selectValue = document.getElementById("select").value; var result; //获取通过下拉框来选择的值来改变加减乘除的运算法则 switch(selectValue){ case '+': result = txt1Value+txt2Value; break; case '-': result = txt1Value-txt2Value; break; case '*': result = txt1Value*txt2Value; break; case '/': result = txt1Value/txt2Value; break; } //设置结果输入框的值 document.getElementById("fruit").value = result; } </script> </head> <body> <input type='text' id='txt1' /> <select id='select'> <option value='+'>+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option> </select> <input type='text' id='txt2' /> <input type='button' value=' = ' onclick="count()"/>  <input type='text' id='fruit' /> </body> </html>

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