JavaScript/TypeScript-承诺循环不会等待

另一种解决方案是使用array reduce链接您的承诺:

var groups = Array.from(new Array(10),(val,index) => 10*index);	// => [0, 10, 20, 30, 40, 50, 60, 70, 80, 90]
groups.reduce((m, o) => {
    return m.then(() => {		
        var group = Array.from(new Array(10), (val, index) => o + index + 1);  // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], [11, 12, 13, 14, 15, 16, 17, 18, 19, 20], ...
        var promises = group.map(i => this.web3.eth.getBlock(i).then(() => winston.info("Processing block " + i)) );
        return Promise.all(promises).then(() => winston.info("+++ Processed " + 10 + " blocks") );
    });
}, Promise.resolve(true));   

它只会给你预期的结果:

因为你每次都要处理10个承诺,所以你可以 await 在每一批10人之后,还是会达不到目的?

var promises = []; // You are mutating it so better not be a const
var blockPromise = null;
for (let i = 1; i <= 100; i ++) {

 blockPromise = this.web3.eth.getBlock(i).then((block: any) => {
      winston.info("Processing block " + i);
 }).catch((err: Error) => {
      winston.error(err);
 });

 promises.push(blockPromise);

 if (i % 10 === 0) {
     await Promise.all(promises);
     promises = [] // clear the processed promises as well
     winston.info("+++ Processed " + 10 + " blocks");
 }
}

let promise = Promise.resolve(), promises = [];
for( let i = 0; i <= 100; i++){
  promises.push(this.web3.eth.getBlock(i).then((block: any) => {
         winston.info("Processing block " + i);
     }).catch((err: Error) => {
         winston.error(err);
  }));

  if (i % 10 === 0){
   promise = Promise.all(promises.concat(promise))
      .then(_=>winston.info("+++ Processed " + 10 + " blocks");  
   promises = [];           
  }
}