js判断两个数组的值是否相等 值的顺序可能不同

Question

请问有什么好的办法可以判断两个数组的值是否相等吗比如：a=['a','b','c','d'];b=['b','c','d','a'];顺序不同但是只要值是相同的话就返回true就可以了谢谢大家

Answer 1

functionf(a,b){
m=newMap()
a.forEach(o=>m.set(o,(m.get(o)||0)+1));
b.forEach(o=>m.set(o,(m.get(o)||0)-1));
for(varvalueofm.values()){
if(value!==0){returnfalse}
}
returntrue
}
                            

Answer 2

isContained=(a,b)=>{
if(!(ainstanceofArray)||!(binstanceofArray))returnfalse;
if(a.length!=b.length)returnfalse;
for(vari=0,len=b.length;iif(a.indexOf(b[i])==-1&&b.indexOf(a[i])==-1){
returnfalse;
}
}
returntrue;
}
arr1=[1,2,3,4,'obj'];
arr2=[4,3,2,1,'obj'];
alert(isContained(arr1,arr2));
如果不习惯箭头函数：
functionisContained(a,b){
if(!(ainstanceofArray)||!(binstanceofArray))returnfalse;
if(a.length!=b.length)returnfalse;
for(vari=0,len=b.length;iif(a.indexOf(b[i])==-1&&b.indexOf(a[i])==-1){
returnfalse;
}
}
returntrue;
}
arr1=[1,2,3,4,'obj'];
arr2=[4,3,2,1,'obj'];
alert(isContained(arr1,arr2));