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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### 數值的擴展 1. Number.isFinite() 檢查數值是否是有限的值,參數不是數值一律返回 false,isFinite會進行Number()對象包裝后再判斷 2. Number.isNaN() 參數除了NaN,一律返回 false,isNaN的轉換同上 3. Number.parseInt() 行為與 parseInt 保持不變 4. Number.parseFloat() 行為與 parseFloat 保持不變 5. Number.isInteger() 判斷一個數值是否是整數,( 超出JS限制的數值,判斷不準 ) 6. ES6在Math對象上新增了17個數學靜態方法 ### 字符串的擴展 1. includes() 2. startsWith() 3. endsWith() 4. repeat() 重復字符串 'x'.repeat( 3 ) 'xxx' 5. padStart() 補全字符串長度 'x'.padStart( 5, 'abab' ) 'ababx' 'x'.padStart( 4, 'ab' ) 'abax' 6. padEnd() 補全字符串長度 'x'.padEnd( 5, 'abab' ) 'xabab' 'x'.padStart( 4, 'ab' ) 'xaba'
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