for in遍历（学习笔记）

for in 既可以遍历数组又可以遍历对象

typeShowClickEvent(index){    let typeName= this.state.typeNameList[index];    let obj = {};    if( typeName == "类型") {    }else {        obj.workOrderTypeString = typeName;    }    if( this.state.statusName == "状态" ) {    }else {        obj.workOrderStatusString = this.state.statusName;    }    if( this.state.city == "城市" ) {    }else {        obj.city = this.state.city;    }    let list = this.state.keepList;    //for in 遍历对象     for(var x in obj) {        // x 为对象的键，obj[x] 为键值        list = list.filter((item,index)=>{            //list 代表的是 代表一个数组            //item 代表数组中的每一项 ，是一个对象            //console.log("item",item);            return item[x] == obj[x];        })    }    if( list.length === 0){        this.props.history.push(`/noorder`);    }else {        this.setState({            type_show: false,            typeName: typeName,            contentList: list,        })    }}