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document.write(h[1].title+"<br>");
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<input type="button" value="获取" onclick="huo()">
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document.write(h[1].title+"<br>")这里的输出写的h[1]，所以只显示第二个div的title，想要循环写成h[i]
用alert()弹出或者console.log()在浏览器控制台输出
函数里第一次调用document.write()把其它内容覆盖了