9/10 homework:
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String.prototype.substr, String.prototype.substring and String.prototype.slice Please take a look at these 3 string function and try to find difference among them. ans: String.slice( begin [, end ] ) String.substring( from [, to ] ) String.substr( start [, length ] ) eg: alert("abc".substr(1,2)); // returns "bc" alert("abc".substring(1,2)); // returns "b", the second parameter is the index to stop at,but not include. Differences: As you can see, the slice() and substring() methods are roughly the same; the only difference is that the slice() method can accept a negative index, relative to the end of the string. Should you try to use a negative index in substring(), it seems to be relative the beginning of the string (and therefore is out-of-bounds). The substr() method can use a negative index; but, rather than using a to-argument, it uses a length-argument. This can be especially useful if you know the length of the substring ahead of time and don't want to perform any superflous math to calculate the necessary indices.
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try to understand prototype at same time if possible
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amcwebportal/webcontent/scripts/ajax.js, there you could find one simple example we are using for prototype AjaxCritiera
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