var count = 0;
setTimeout(function(){
console.log("step1", count);
count += 1;
setTimeout(function(){
console.log("step2", count);
count += 1;
setTimeout(function(){
console.log("step3", count);
count += 1;
setTimeout(function(){
console.log("step4", count);
count += 1;
setTimeout(function(){
console.log("step5", count);
count += 1;
setTimeout(function(){
console.log("step6", count);
count += 1;
}, 1000);
}, 1000);
}, 1000);
}, 1000);
}, 1000);
}, 1000);
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这么写?