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var a = [100,200,300];
var b = [{id:'100',name:'小紅'},{id:'300',name:'小明'},{id:'200',name:'小藍(lán)'}];

var result = b.sort((aa, bb) => (a.indexOf(aa.id - 0) - a.indexOf(bb.id - 0)));

// 不考慮重復(fù)ID的話方法還有很多：
result = a.map(el_a=>(b.find(el_b => el_b.id == el_a)));
result = b.reduce((acc,cur) => (acc[a.indexOf(cur.id - 0)] = cur, acc), []);

var a = [100,200,300]
var b = [{id:'100',name:'小紅'},{id:'300',name:'小明'},{id:'200',name:'小藍(lán)'}]

function sortSome(a, b){
    var arr = [];
    a.forEach(function(tem, index){
      b.forEach(function(val, num){
        if(tem == val.id){
          arr.push(val);
      }
    })
  })
  return arr;
}
console.log(sortSome(a,b))

let c=[];

for(let num of a){
    b.forEach(item => {
        if(item.id == num) c.push(item)
    })
}

var a = [100,200,300]
    var b = [{id:'100',name:'小紅'},{id:'300',name:'小明'},{id:'200',name:'小藍(lán)'}]
     var obj={};
       b.forEach((x)=>{
           obj[x.id]=x
       })
       var arr=a.map((x)=>{
           return obj[x]
       })
       console.log(arr)

只循環(huán)一次：

b.forEach(function(ele, index, arr) {
    if (a.indexOf(parseInt(ele.id)) > -1)
        this[a.indexOf(parseInt(ele.id))] = ele;
}, out = [])
console.log(JSON.stringify(out));