SOURCE

/*
*    判断括号有效性
*/

const str = "{[()]()}";

const valid = (str)=>{
    let pool= [];

   for(let i = 0;i<str.length;i++){
       let s = str[i]
       if(pool.length){
           let current = pool[pool.length-1] + s;
           if(current == '[]' || current == '{}' || current == '()'){
               pool.pop();
           }else{
               pool.push(s)
           }
       }else{
           pool.push(s)
       }
    }
    console.log(pool)
    return !Boolean(pool.length);
}

console.log(valid(str)) // true/false