Question

这个功能有什么问题？第一个if语句确实有效。但是else语句不起作用。

function func() {
    if (document.getElementById("pic2").src = "pause.png") {
        document.getElementById("pic2").src = "play.png";
    } else {
        document.getElementById("pic2").src == "pause.png";
    }
}

HTML：

<div id="all" onclick="func()" onmouseover="func3()">
            <div id="background" onclick="func()" onmouseout="func2()"></div>
            <div id="pic">
                <img id="pic2" src="pause.png">
            </div>
            <video>
                <source src="test.mp4" type="video/mp4">
            </video>
        </div>

Answer 1

很少有东西不能让你切换你的img src。

条件检查不当。 if (document.getElementById("pic2").src = "pause.png")必须为if (document.getElementById("pic2").src == "pause.png")
document.getElementById("pic2").src会为您提供图片的完整路径。最好使用img_url.substr(img_url.lastIndexOf("/")+1);

＆＃13;

function func() {
    var img_url = document.getElementById("pic2").src;
    var img = img_url.substr(img_url.lastIndexOf("/")+1);
    if (img  == "pause.png") {
        document.getElementById("pic2").src = "play.png";
    } else {
        document.getElementById("pic2").src = "pause.png";
    }
}

function func2(){
 // your func2
}

function func3(){
 // your func3
}

＆＃13;

<div id="all" onclick="func()" onmouseover="func3()">
            <div id="background" onclick="func()" onmouseout="func2()"></div>
            <div id="pic">
                <img id="pic2" src="pause.png">
            </div>
            <video>
                <source src="test.mp4" type="video/mp4">
            </video>
        </div>

＆＃13;

Answer 2

单个等号标志用于分配值。你必须添加两个等于比较两个变量或值。
像这样： -

function func() {
    if (document.getElementById("pic2").src == "pause.png") {
        document.getElementById("pic2").src = "play.png";
    } else {
        document.getElementById("pic2").src = "pause.png";
    }
}

Answer 3

试试这个：

s.close()
# the socket is closed, you can't use it anymore!

# get another one:
s2 = socket.socket()
s2.connect(('127.0.0.1',5000))
s2.close()
# now s2 is closed, you can't use it anymore!

祝你好运

带有更改网址的if语句

3 个答案: