JavaScript 代碼壓縮是指去除源代碼裡的所有不必要的字元，而不改變其功能的過程。這些不必要的字元通常包括空格字元，換行字元，注釋以及塊分隔符等用來增加可讀性的代碼，但并不需要它來執行。
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It is a nice looking tool with an API to minify your js code.
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JSCompress.com is an online javascript compressor that allows you to compress and minify your javascript files. Compressed javascript files are ideal for production environments since they typically reduce the size of the file by 30-90%. Most of the filesize reduction is achieved by removing comments and extra whitespace characters that are not needed by web browsers or visitors.
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