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Update binary_search.md
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=== "JavaScript"
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```js title=""
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// JavaScript 中的数字足够大(最大数值为 1.7976931348623157e+308 )
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// 因此无需考虑大数越界问题
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// (i + j) 有可能超出 int 的取值范围
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let m = parseInt((i + j) / 2);
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// 更换为此写法则不会越界
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let m = parseInt(i + (j - i) / 2);
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```
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=== "TypeScript"
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