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javascript ÖнØÈ¡×Ö·û´®µÄÒªÁìÓÐËÄÖÖ£º1. ʹÓà slice() ÒªÁì £¬Ìṩ×îÏȺͿ¢ÊÂË÷Òý£»2. ʹÓà substring() ÒªÁì £¬Óë slice() ÀàËƵ«²»¿ÉʹÓøºË÷Òý£»3. ʹÓà substr() ÒªÁì £¬Ìṩ×îÏÈË÷ÒýºÍ½ØÈ¡³¤¶È£»4. ʹÓÃÕýÔò±í´ïʽ¾ÙÐÐÆ¥Å䡣ѡժҪÁìӦƾ֤ÏêϸÐèÇó £¬ÆäÖÐ slice() ÒªÁì×îΪ³£ÓÃÇÒÎÞа¡£

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1. ʹÓà slice() ÒªÁì

slice() ÒªÁìÊÇ×î³£ÓõĽØÈ¡×Ö·û´®µÄÒªÁì¡£Ëü½ÓÊÜÁ½¸ö²ÎÊý£º

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const str = "Hello World";
const result = str.slice(0, 5); // "Hello"
console.log(result);

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2. ʹÓà substring() ÒªÁì

substring() ÒªÁìÓë slice() ÒªÁìÀàËÆ £¬µ«Ëü²»½ÓÊܸºË÷Òý¡£

const str = "Hello World";
const result = str.substring(0, 5); // "Hello"
console.log(result);

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3. ʹÓà substr() ÒªÁì

substr() ÒªÁìÊÇÒ»¸ö½Ï¾ÉµÄÒªÁì £¬Óë slice() ÒªÁìÀàËÆ £¬µ«Ëü½ÓÊܵÚÒ»¸ö²ÎÊý×÷Ϊ×îÏȽØÈ¡µÄË÷Òý £¬µÚ¶þ¸ö²ÎÊý×÷Ϊ½ØÈ¡µÄ³¤¶È¡£

const str = "Hello World";
const result = str.substr(0, 5); // "Hello"
console.log(result);

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4. ʹÓÃÕýÔò±í´ïʽ

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const str = "Hello World";
const result = str.match(/Hello/g); // ["Hello"]
console.log(result);

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