<!DOCTYPE html><html> <head> <title> 事件</title> <script type="text/javascript"> function count(){ var Otx1=document.getElementById("txt1").value; var Otx2=document.getElementById("txt2").value; var Osel=document.getElementById("select").value; var Ores=""; switch(Osel) { case "+": Ores=parseInt(Otx1)+parseInt(Otx2); break； case "-": Ores=parseInt(Otx1)-parseInt(Otx2); break； case "*": Ores=parseInt(Otx1)*parseInt(Otx2); break； default: Ores=parseInt(Otx1)/parseInt(Otx2); } document.getElementById("fruit").value=Ores; /*var oTxt1 = document.getElementById("txt1").value; var oTxt2 = document.getElementById("txt2").value; var oSlt = document.getElementById("select").value; var result = ""; switch(oSlt) { case "+": result = parseFloat(oTxt1) + parseFloat(oTxt2); break; case "-": result = parseFloat(oTxt1) - parseFloat(oTxt2); break; case "*": result = parseFloat(oTxt1) * parseFloat(oTxt2); break; default: result = parseFloat(oTxt1) / parseFloat(oTxt2); } 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()"/> <!--通过 = 按钮来调用创建的函数，得到结果--> <input type='text' id='fruit' /> </body></html>
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