方法一
function fn0(ary) {
for(var i=0;i<ary.length;i++){
for (var j=0;j<i;j++){
if(ary[i]==ary[j]){
ary.splice(i,1);
i--;
}
}
}
return ary;
};
console.log(fn0(ary));
方法二
function fn1(ary) {
return ary.map((item,index)=>{
if(ary.indexOf(item)==ary.lastIndexOf(item)){
return item;
}
});
};
console.log(fn1(ary));
方法三
function fn2(ary) {
ary.forEach((item,index)=>{
if(ary.indexOf(item)!==ary.lastIndexOf(item)){
ary.splice(index,1)
}
});
return ary;
};
console.log(fn2(ary));
方法四
function fn3(ary) {
let obj={};
ary.forEach((item)=>{
obj[item]=item;
});
ary=[];
for (let key in obj){
ary.push(obj[key])
}
return ary
};
console.log(fn3(ary));
方法五
function fn4(ary) {
return ary.filter((item,index)=>{
return !ary.slice(0,index).includes(item);
})
};
console.log(fn4(ary));
方法六
function fn5(ary) {
return [...new Set(ary)]
};
console.log(fn5(ary));
方法七
function fn6(ary) {
return Array.from(new Set(ary))
};
console.log(fn6(ary));
