Code , <A href = "#" onclick = "javascript: getadd ();"> although the DIV output content of the id = "book" implemented by the getadd () function, this is one of the core local skills, but the href = "#" element makes the page automatically jump to the top of the page and it feels uncomfortable. Because the page will beat, the experience of partial refresh is not strong.
So I removed the #, and the remaining href = "". If this happens, the page will be refreshed again after loading.
Finally, we can see other people's code and get the solution. <a href = "javascript: void (0)">.
The meaning of void (0) in javascript:
In JavaScript, void is an operator that specifies to calculate an expression but does not return a value.
The format of the void operator is as follows:
1. javascript: void (expression)
2. javascript: void expression
Expression is a standard JavaScript expression to be calculated. Parentheses outside the expression are optional, but it is a good habit to write. You can use the void operator to specify a hyperlink. The expression is calculated, but no content is loaded in the current document. The code above creates a hyperlink, and nothing will happen after the user clicks. When a user clicks a link, void (0) is calculated as 0, but it has no effect on JavaScript.
<A href = "javascript: void (0)"> click here. </a>
That is to say, if you want to perform some processing, but do not refresh the page as a whole, you can use void (0). However, when you need to refresh the page, you have to be careful.
In fact, we can use <a href = "javascript: void (document. Form. Submit ()"> to perform a submit operation. Under what circumstances will void (0) be used more often, without refreshing the new version? Of course it is Ajax. If you look at Ajax web pages, you will usually see a lot of void (0 ), :), so before using void (0), you 'd better think about whether the page needs to be refreshed as a whole.
