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谁可以帮我看看 这小段代码哪里错了 <html><title>simple calculate</title><head><script type="test/javascript"> var clearFlag=false; function getNum(num){ var objnumber=document.getElementById("testfield"); if(clearFlag){ objnumber.value=""; clearFlag=false;} objnumber.value+=num; } function count(){ var objnumb=document.getElementById("testfield"); objnumb.value=objnumb.value+"="+eval(objnumb.value); clearFlag=true;} </script></head><body><table border="1";><caption><b>This is the Calculate</b></caption><tr><td colspan="4"><input type="text" name="nos" size="43" id="testfield" ></td></tr><tr><td><input type="button" value=" 1 " onclick="getNum(1)" /></td><td><input type="button" value=" 2 " onclick="getNum(2)" ></td><td><input type="button" value=" 3 " onclick="getNum(3)" ></td><td><input type="button" value=" + " onclick="getNum('+')" ></td></tr><tr><td><input type="button" value=" 4 " onclick="getNum(4)" ></td><td><input type="button" value=" 5 " onclick="getNum(5)" ></td><td><input type="button" value=" 6 " onclick="getNum(6)" ></td><td><input type="button" value=" - " onclick="getNum('-')" ></td></tr><tr><td><input type="button" value=" 7 " onclick="getNum(7)" ></td><td><input type="button" value=" 8 " onclick="getNum(8)" ></td><td><input type="button" value=" 9 " onclick="getNum(9)" ></td><td><input type="button" value=" * " onclick="getNum('*')" ></td></tr><tr><td><input type="button" value=" . " onclick="getNum('.')" ></td><td><input type="button" value=" 0 " onclick="getNum(0)" ></td><td><input type="button" value=" = " onclick="count()" ></td><td><input type="button" value=" / " onclick="getNum('/')"></td></tr> </table></body></html>
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