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function getCaption(obj,state) { var index=obj.lastIndexOf("\-"); if(state==0){ obj=obj.substring(0,index); }else { obj=obj.substring(index+1,obj.length); } return obj; } var data = 'aaa-bbb' //截取符号前面部分 getCaption(data,0) //输出aaa //截取符号后面部分 getCaption(data,1) //输出bbb