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<input type="text" id="cip" value="Hello world!" />
<script>
var body = 'var returnCitySN = {"cip": "183.11.68.150", "cid": "440300", "cname": "广东省深圳市"}';
eval(body);
document.getElementById("cip").value = returnCitySN.cip;
</script>
<form>
<input type="text" id="cip" value="">
<input type="submit" value="提交">
</form>
<script src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
<script type="text/javascript">
document.getElementById("cip").value = returnCitySN.cip;
</script>
<input type="text" id="cip" value="Hello world!" />
<script>
var body = 'var returnCitySN = {"cip": "183.11.68.150", "cid": "440300", "cname": "广东省深圳市"}';
eval(body);
document.getElementById("cip").value = returnCitySN.cip;
</script>
放到html 页面打开看看把。。