摘要:
1. what is the difference between classes and ID's in CSS?A: ID's are unique: Each element can only have one ID Each page can only have one e... 阅读全文
摘要:
The HTML DOM is a standard for how to get, change, add, or delete HTML elements.Nodes Element nodes Text nodes : text node is contained within eleme... 阅读全文
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1. An postfix M means the file has been modified since the last "commit" and an A means this is a file that has been added since then.2. what is keepi... 阅读全文
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1. !! meansCoercesoObjectto boolean. If it was falsey (e.g. 0,null,undefined, etc.), it will befalse, otherwise,true.2. check what device it isfunctio... 阅读全文