let start = performance.now();
let sum = 0;
for (let i = 0; i < 200000; i++) {
for (let i = 0; i < 1; i++) {
sum += Math.random()
}
}
let end = performance.now();
console.log(end - start)
let start = performance.now();
let sum = 0;
for (let i = 0; i < 200000; i++) {
for (let i = 0; i < 1; i++) {
sum += Math.random()
}
}
let end = performance.now();
console.log(end - start)
本文标题：使用 performance 测试代码执行时间
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