js计算耗时，可多次调用获取耗时

js计算耗时，可多次调用获取耗时

let globalSinceTime = {}

async function sinceTime(title = "默认标记") {
    try {
        let startTime = 0
        if (window.hasOwnProperty("performance")) {
            startTime = window.performance.now()
        } else {
            startTime = new Date().getTime()
        }
        globalSinceTime[title] = startTime
        return Promise.resolve(true)
    } catch (e) {
        return Promise.resolve(false)
    }
}

async function sinceTimeEnd(title = "默认标记") {
    try {
        let endTime = 0
        if (window.hasOwnProperty("performance")) {
            endTime = window.performance.now()
        } else {
            endTime = new Date().getTime()
        }
        let startTime = 0
        if (globalSinceTime.hasOwnProperty(title)) {
            startTime = globalSinceTime[title]
        }
        let since = endTime - startTime
        console.log(title + " 耗时:", since, "毫秒")
        return Promise.resolve(since)
    } catch (e) {
        return Promise.resolve(false)
    }
}

使用

    sinceTime()
    console.time("耗时1")
    console.time("耗时2")
    setTimeout(() => {
        sinceTimeEnd()
        console.timeEnd("耗时1")
    }, 1000)
    setTimeout(() => {
        sinceTimeEnd()
        console.timeEnd("耗时2")
    }, 2000)

运行结果

默认标记 耗时: 1009.7999999970198 毫秒
耗时1: 1009.777099609375 ms
默认标记 耗时: 2011.4000000059605 毫秒
耗时2: 2011.431884765625 ms

 本文链接

 https://www.cnblogs.com/stumpx/p/16285700.html