尝试通过onclick函数（）括号传递不同的变量

Question

我试图通过函数传递几个不同的案例

<div id="button1" class="button" onclick="pop(case1)">popup a</div>

然后我想在我的函数中创建不同的案例

function pop(a){
    if (a='case1') {var mytext = "you pressed the popup case1"; var myclass=a;}
    else if (a='case2'){var mytext = "you pressed the popup case2"; var myclass=a;}
    else if (a='case3'){var mytext = "you pressed the popup case3"; var myclass=a;}

var p1 = document.createElement("div");
    p1.classname =myclass;
    p1.innerHTML=mytext;
    document.body.appendChild(p1);
}

这是我为它制作的小提琴 http://jsfiddle.net/alexnode/WqsNJ/1/ 如何才能正确地创建条件？目前我总是获得case1弹出窗口。

Answer 1

问题是您使用=进行分配，而非使用==进行核对，将=更改为==。< / p>

http://jsfiddle.net/WqsNJ/2/

if (a=='case1') {var mytext = "you pressed the popup case1"; var myclass=a;}
else if (a=='case2'){var mytext = "you pressed the popup case2"; var myclass=a;}
else if (a=='case3'){var mytext = "you pressed the popup case3"; var myclass=a;}

Answer 2

为了比较JavaScript中的字符串，您需要使用is 等于运算符（==）而不是等号（=）< /强>

所以正确的代码应该是

function pop(a){
    if (a=='case1') {var mytext = "you pressed the popup case1"; var myclass=a;}
    else if (a=='case2'){var mytext = "you pressed the popup case2"; var myclass=a;}
    else if (a=='case3'){var mytext = "you pressed the popup case3"; var myclass=a;}

var p1 = document.createElement("div");
    p1.classname =myclass;
    p1.innerHTML=mytext;
    document.body.appendChild(p1);
}