Why is the substring method behaving in this manner?

var str ="20110725";
var dd = str.substring(6);
var mm = str.substring(4,2);
var yyyy = str.substring(0,3);
alert(dd );//25
alert(mm);//11
alert(yyyy );//2011

Instead of the above output, I expected "25" as date, "07" as month 开发者_如何转开发and "2011" as year. Please correct me.

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I think you want substr(), not substring(). They're different.

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You should have

var mm = str.substring(4, 6);

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Instead of:

var mm = str.substring(4, 2)

Do:

var mm = str.substring(4, 6)

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Try this. You also need a 4, not a 3 for your year.

var str ="20110725";
var dd = str.substr(6);
var mm = str.substr(4,2);
var yyyy = str.substr(0,4);
alert(dd );//25
alert(mm);//11
alert(yyyy );//2011