when you click on the a function and call the b function in the an execution, the b function is an interval timer, so why not execute it regularly and only once?
a(item,key){
//....(
this.Time=setInterval(this.b(item,key),1000);
//
}
},
b(item,key){
console.log(item);
console.log(key);
//
} 
Why is the timer invalid?
this.b (item,key) must return a method instead of executing it once
b(item,key){
return function(){
console.log(item);
console.log(key);
}
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