jstl中调用js方法
    English Answer:
    JavaServer Pages Standard Tag Library (JSTL) is a set of tags that allows developers to easily access and manipulate data from various sources in their JSP pages. However, JSTL does not provide direct support for calling JavaScript functions. To bridge this gap and enable communication between JSP and JavaScript, developers can leverage custom tag libraries or use JavaScript libraries that integrate with JSTL.
    One approach involves creating a custom tag library that wraps the desired JavaScript function. The following example demonstrates how to create a custom tag called `callJavaScript` that invokes a JavaScript function named `myFunction` when rendered:
    java.
    import javax.servlet.jsp.tagext.TagSupport;
    import javax.servlet.jsp.JspException;
    import javax.servlet.jsp.JspWriter;
javascript void 0 是什么意思
    public class CallJavaScriptTag extends TagSupport {。
        private String functionName;
        public void setFunctionName(String functionName) {。
            this.functionName = functionName;
        }。
        @Override.
        public int doStartTag() throws JspException {。
            try {。
                JspWriter out = Out();
                out.write("<script>");
                out.write("function callJavaScript() { " + functionName + "(); }");
                out.write("</script>");
            } catch (Exception e) {。
                throw new JspException("Error calling JavaScript function", e);
            }。
            return SKIP_BODY;
        }。
    }。
    In your JSP page, you can use the `callJavaScript` tag as follows:
    jsp.
    <%@ taglib uri="myTagLib" prefix="my" %>。

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