<!DOCTYPE html><html> <head> <meta charset="utf-8" /><script type="text/javascript"> function count(){ var txt1 = parseInt(document.getElementById("txt1").value); var txt2 = parseInt(document.getElementById("txt2").value); var select1 = document.getElementById("select").value; var result=""; switch(select1){ case "+": result = txt1+txt2; break; case "-": result = txt1-txt2; break; case "*": result = txt1*txt2; break; default: result = txt1/txt2; } 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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snowmanJS
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<input type='button' value=' = ' onclick=count()/> 应改为 <input type='button' value=' = ' onclick="count()" />
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