JS中操作数组、字符串的速度比较
对相同轻量级的数组和字符串进行检索:const arr = const string = '12345678q'const Q = 'q'const TIME = 2000000000
setTimeout(() => { console.log('arr...') console.time('array') let res = true for (let i = 0; i < TIME; i++) { if (arr.indexOf(Q) === -1) { res = false break } } console.log(res) console.timeEnd('array')})
setTimeout(() => { console.log('string...') console.time('string') let res = true for (let i = 0; i < TIME; i++) { if (string.indexOf(Q) === -1) { res = false break } } console.log(res) console.timeEnd('string')})
打印结果如下:
https://img2022.cnblogs.com/blog/2362419/202206/2362419-20220625230825861-264923205.png
结论:对小内存的数据进行操作,操作字符串比数组快,比如可以在dom的类名中使用className进行检索类名检索,而不是classList
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