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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                一、for循環法遍歷法 ```js function getZeroCount(num) { let count = 0; let regObj = /0/g; for (let i = 1; i <= num; i++) { let str = '' + i; let match = str.match(regObj); count += match == null ? 0 : match.length; } return count; } console.log(getZeroCount(10000)); ``` 二、split切割法 ```js function getZeroCount(num) { return Array.from({length: num}, (v, i) => i + 1).join().split("0").length - 1; } console.log(getZeroCount(10000)); ``` > **切割法思路** > 首先,判斷一個字符串有幾個0,除了正則外還可以利用.split()。比如: > ``` > var str = "1029304910"; > var len = str.split("0").length - 1; > ``` > 其次,有沒有必要把每個數字挨個檢驗?或許可以先把他們拼接起來,比如利用Array.join()。
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