function randomChar(m){
	//m为随机字符串的长度
	var x="0123456789poiuytrewqasdfghjklmnbvcxzQWERTYUIOPLKJHGFDSAZXCVBNM";
	var tmp="";
	for(var i=0;i<m;i++) {
	tmp += x.charAt(Math.ceil(Math.random()*100000000)%x.length);
	}
	return tmp;
}
var sid = randomChar(10);
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