javascript 两个字符串比较函数

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<title>Untitled</title> 
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<form name = "f"> 
<input type = "text" name = "s1"> 
<input type = "text" name = "s2"> 
<input type = "button" name = "compare" value = "比较" onclick = "diff()"> 
</form> 
</body> 
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