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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script type="text/javascript">
var mystr="Hello World!";
document.write(mystr.substr(mystr.indexOf("W") )+ "<br />");
document.write(mystr.substr(0,mystr.indexOf(" ")) );// 注意
mystr.indexOf(" ")和mystr.indexOf("")是不一样的，前者为有效空格
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