1.直接document.write
<script> <BR>document.write(<script src='test.js'><\/script>); <BR></script>
2.动态改变已有script的src属性
<script></script>
<script> <BR>s1.src=test.js <BR></script>
3.动态创建script元素
<script> <BR>var s2 = document.createElement(script); <BR>s2.src=test.js <BR>document.body.insertAdjacentElement(BeforeBegin,s2); <BR></script>
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