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kelingm
// 并发连接数的计数器 var concurrencyCount = 0; var fetchUrl = function (url, callback) { // delay 的值在 2000 以内,是个随机的整数 var delay = parseInt((Math.random() \* 10000000) % 2000, 10); concurrencyCount++; console.log('现在的并发数是', concurrencyCount,...