從回調函數訪問數據

Question

let toggleForm = function() { 
    // code here 
    } 

    document.getElementById('one').addEventListener("click", toggleForm, false); 

    document.getElementById('two').addEventListener("click", toggleForm, false); 

在toggleForm中，我想知道元素1或2是否觸發了事件。你會怎麼做呢？

Answer 1

使用e.target：

<button id = 'one'>One</button> 
<button id = 'two'>Two</button> 
<script> 
    var one = document.getElementById('one'), 
    two = document.getElementById('two'); 
    let toggleForm = function(e) { 
    if (e.target === one) alert('One'); 
    else alert('Two'); 
    }; 
    one.addEventListener("click", toggleForm, false); 
    two.addEventListener("click", toggleForm, false); 
</script>