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PHPz批改状态：合格
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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>简单计算器</title></head><body><div style="width: 200px;margin: auto; background-color:rgb(184, 249, 237);"><input type="text" size="5" id="num1" value="" /><select id="ysf"><option value="+">+</option><option value="-">-</option><option value="*">*</option><option value="/">/</option><option value="%">%</option></select><input type="text" size="5" id="num2" value=""/><input type="button" value="计算" id="btn" /></div><p id="res" style="width: 200px;margin: 10px auto; background-color:rgb(184, 249, 237);"></p><script>//获取按钮注册事件document.getElementById('btn').onclick=function(){var num1 = document.getElementById('num1').value;var num2 = document.getElementById('num2').value;var ysf = document.getElementById('ysf').value;// 简单判断输入的内容只能是数字if (num1 == NaN || num2 == NaN){window.alert('请输入数字进行计算');}else{// document.getElementById('res').innerHTML=num1+"---"+num2+"---"+ysf;var res = document.getElementById('res');if(ysf == '+'){res.innerHTML = num1 + ysf + num2 + '=' + (parseInt(num1) + parseInt(num2));};if(ysf == '-'){res.innerHTML = num1 + ysf + num2 + '=' + (num1 - num2);};if(ysf == '*'){res.innerHTML = num1 + ysf + num2 + '=' + (num1 * num2);};if(ysf == '/'){// 判断被除数不能为0if(num2 == 0){window.alert('被除数不能为0');}else{res.innerHTML = num1 + ysf + num2 + '=' + (num1 / num2);}};}};</script></body></html>
上图
js代码
<script>document.write('<table border="1" width="800" align="center">')for(var row = 9; row > 0; row--){document.write('<tr>')for(var col = 1; col <= row; col++){document.write('<td>' + col + '*' + row + '=' + col * row + '</td>')// console.log(col + '*' + row + '=' + col * row)}document.write('</tr>')}document.write('</table>')</script>
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