Unable to add event

Question

function addEvent(obj, type, fn) {    alert('a');    if (typeof obj.addEventListener != 'undefined') {        alert('b');    obj.addEventListener(type, fn, false);    } else if (typeof obj.attachEvent != 'undefined') {    obj.attachEvent('on'   type, fn);    alert('c');    } }

无法使用

Answer 1

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