Photo by Mohammad Rahmani on Unsplash
使用內建函式
// test performance function
const testPerformance = (testName, testFunction) => {
const startTime = new Date().getTime();
let i = 0;
while (i < 10000000) {
i++;
testFunction();
}
const endTime = new Date().getTime();
// jsonStringify 3698 ms
console.log(testName, endTime - startTime, 'ms');
};
// 執行測試
testPerformance('jsonStringify', jsonStringify);
// 要測試的功能
function jsonStringify() {
JSON.stringify({ foo: 'name' });
}
let start;
let end;
start = new Date();
// Do something here
for (var i = 0; i < 1000; i++) {
Math.sqrt(i);
}
end = new Date();
// Operation took 0 ms
console.log('Operation took ' + (end.getTime() - start.getTime()) + ' ms');
使用 chrome devtool 的函式
const timeTaken = (callback) => {
console.time('timer');
const r = callback();
console.timeEnd('timer');
return r;
};
timeTaken(() => {
// Do something here
for (var i = 0; i < 1000; i++) {
Math.sqrt(i);
}
});
參考資料
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