Question

当我按下a-tag时，我想运行以下内容：

<a id="demo">Hello.</a>

<script>
  document.getElementById("demo").onclick = function() {myFunction()};
  var url = "http://www.google.com";
  var myWindow = window.open(url, "http://www.google.com", "width=700,height=275");
</script>

如何正确地实现它，只在按下a-tag时运行var？我基于以下内容：

<a id="demo">Hello.</a>
				
<script>
  document.getElementById("demo").onclick = function() {myFunction()};
  function myFunction() {document.getElementById("demo").innerHTML = "Hi there!";}
</script>

非常感谢！

Answer 1

您在var函数中未包含这两个onclick语句，因此它们一直在运行。

此外，要使<a>元素更正，它需要href属性。如果你真的不想在任何地方导航，你根本不需要一个<a>元素，你可以使用几乎任何其他元素，只需为它分配一个click事件处理程序完全相同的方式你正在使用<a>元素。请参阅下面的代码示例：

#demo { cursor:pointer; }

<div id="demo">Hello.</d>

<script>
  document.getElementById("demo").onclick = function() {
    var url = "http://www.google.com";
    var myWindow = window.open(url, "http://www.google.com", "width=700,height=275");   
  };
</script>

Answer 2

您刚刚丢失了在点击处理程序中调用的<a id="demo">Hello.</a> <script> document.getElementById("demo").onclick = function() { var url = "http://www.google.com"; var myWindow = window.open(url, "http://www.google.com", "width=700,height=275"); }; </script>的定义。

您可以直接在onclick中移动它，如下所示：

＆＃13;

{{1}}

＆＃13;

Answer 3

您必须编写如下代码：

<a id="demo">Hello.</a>

<script>
document.getElementById("demo").addEventListener("click", function(){
  alert("Hi")
})
</script>

Answer 4

package main

import (
    "fmt"
    "sync"
)

func main() {

    in := gen()

    f1 := factorial(in) // code to be replaced
    f2 := factorial(in) // code to be replaced
    for n := range merge(f1, f2) { // code to be replaced
        fmt.Println(n) // code to be replaced
    } // code to be replaced

    // What I'd like to use instead of the above...
    //var res [2]<-chan int
    //res[0] = make(chan int)
    //res[0] = factorial(in)
    //res[1] = make(chan int)
    //res[1] = factorial(in)
    // for n := range merge(res...)
    //  fmt.Println(n)
    //}
    // This commented code generates the following error
    //$ go run main.go
    //# command-line-arguments
    //.\main.go:20: cannot use res (type [2]<-chan int) as type []<-chan int in argument to merge

}

func gen() <-chan int {
    out := make(chan int)
    go func() {
        for i := 0; i < 100; i++ {
            for j := 3; j < 13; j++ {
                out <- j
            }
        }
        close(out)
    }()
    return out
}

func factorial(in <-chan int) <-chan int {
    out := make(chan int)
    go func() {
        for n := range in {
            out <- fact(n)
        }
        close(out)
    }()
    return out
}

func fact(n int) int {
    total := 1
    for i := n; i > 0; i-- {
        total *= i
    }
    return total
}

func merge(cs ...<-chan int) <-chan int {
    out := make(chan int)
    var wg sync.WaitGroup
    wg.Add(len(cs))
    for _, c := range cs {
        go func(ch <-chan int) {
            for n := range ch {
                out <- n
            }
            wg.Done()
        }(c)
    }
    go func() {
        wg.Wait()
        close(out)
    }()
    return out
}

如何将单击侦听器添加到A元素

4 个答案: