vue数组去重2种方法

方法一：用2个for循环，判断每一项的id案列：that.positions.map(train=>{that.new_Positions.push( train.trainId)})that.resultArr = [];//去重后的数组...

JefferyZhang

8195人浏览 · 2021-07-20 15:41:16

JefferyZhang · 2021-07-20 15:41:16 发布

方法一：用2个for循环，判断每一项的id

案列：

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：

方法二：用... new set 实现

案列如下：

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)

打印的结果：

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