vue.js如何实现数组去重

vue.js实现数组去重的方法：使用两个for循环来判断每一项的id，如【that.positions.map(train=>{that.new_Positions.push( train.trainId)})that.resul...】。

本文操作环境：windows10系统、vue 2.5.2、thinkpad t480电脑。

vue.js中实现数组去重可以考虑使用for循环和... new set两种方式来实现，一起来看下吧！

第一种方法：

用2个for循环，判断每一项的id

具体代码如下：

                            // that.positions.map(train=>{
                            //     that.new_Positions.push( train.trainId)
                            // })
                            //     that.resultArr = [];//去重后的数组
                            //     var flag;
                            //     for (var i in that.new_Positions){
                            //         flag = true;
                            //         for (var j in that.resultArr) {
                            //             if (that.resultArr[j] == that.new_Positions[i]) {
                            //                 flag = false;
                            //                 break;
                            //             }
                            //         }
                            //         if (flag) {
                            //             that.resultArr.push(that.new_Positions[i]);
                            //         }
                            //     }
                            // console.log("that.resultArr:",that.resultArr)

打印的结果：

第二种方法：

用... new set 实现

具体代码如下：

                            that.positions.map(train=>{
                                that.new_Positions.push(train.trainId)
                            })
 
                            that.new_Positions = [...new Set(that.new_Positions)];
                            console.log("that.resultArr:",that.new_Positions)

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