Fixed a bug of subscribe
Fixed a bug of subscribe

rucila/hprose-html5,pronebel/hprose-html5,caohui123/hprose-html5,QianChenglong/hprose-html5,pronebel/hprose-html5,QianChenglong/hprose-html5,rucila/hprose-html5,hprose/hprose-html5,caohui123/hprose-html5,hprose/hprose-html5