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PHPz批改状态：合格
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<!DOCTYPE html><html><head><meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1"><title>简单计算器</title></head><body><input type="text" name="" id="num1" value="" /><select name="" id="method"><option value="+" selected="selected">+</option><option value="-">-</option><option value="*">*</option><option value="/">/</option><option value="%">%</option></select><input type="text" name="" id="num2" value="" /><input type="button" name="" id="calc" value="计算" /><div class="" id="result"></div><script type="text/javascript">document.getElementById('calc').onclick = function(){var num1 = document.getElementById('num1').value;var num2 = document.getElementById('num2').value;var method = document.getElementById('method').value;var res = 0;num1=parseFloat(num1);num2=parseFloat(num2);if(isNaN(num1)){document.getElementById('result').innerHTML = '第一个数不是数字';return;}if(isNaN(num2)){document.getElementById('result').innerHTML = '第二个数不是数字';return;}switch(method){case '+' :res = num1 + num2;document.getElementById('result').innerHTML = '运算结果：'+ num1 + '+' + num2 + '=' + res;break;case '-' :res = num1 - num2;document.getElementById('result').innerHTML = '运算结果：'+ num1 + '-' + num2 + '=' + res;break;case '*' :res = num1 * num2;document.getElementById('result').innerHTML = '运算结果：'+ num1 + '*' + num2 + '=' + res;break;case '/' :if(num2 == 0){document.getElementById('result').innerHTML = '除数不能为0';return;}res = num1 / num2;document.getElementById('result').innerHTML = '运算结果：'+ num1 + '/' + num2 + '=' + res;break;case '%' :if(num2 == 0){document.getElementById('result').innerHTML = '除数不能为0';return;}res = num1 % num2;document.getElementById('result').innerHTML = '运算结果：'+ num1 + '%' + num2 + '=' + res;break;}}</script></body></html>
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