问题在代码的注释里：<!DOCTYPE html><html><head> <title>Dynamic Script Example 2</title></head><body> <p>You should see an alert saying "hi" after clicking the button.</p> <input type="button" value="Add Script" onclick="addScript()"> <script type="text/javascript"> function loadScriptString(){ var script = document.createElement("script"); var code="function sayHi(){alert('hi');}"; script.type = "text/javascript"; try { script.appendChild(document.createTextNode(code)); } catch (ex){ script.text = "code";//就是这一行里的"code"， //这里为什么不是字面上的code， //而是function sayHi(){alert('hi');}？ //感觉反直觉。 //试了下script.text = code;也是可以的。 } document.body.appendChild(script); } function addScript(){ loadScriptString(); sayHi(); } </script></body></html>
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