JavaScript debugging
要怎麼解決 Uncaught TypeError: Cannot set property ‘onClick’ of null ?
HTML DOM Document addEventListener()
document.getElementById("#register button").onclick=function(){
alert('222');
}
//方法一：
window.onload = function () {
document.getElementById("register").onclick=function(){
alert('222');
}
}
//方法二：（支援各大瀏覽器）
if(window.addEventListener){
window.addEventListener("load",alert1,false);
window.addEventListener("load",alert2,false);
}
else{
window.attachEvent("onload",alert1);
window.attachEvent("onload",alert2);
}
function alert1(){
document.getElementById("register").onclick=function () {
alert('測試1');
};
}
function alert2(){
document.getElementById("register").onclick=function () {
alert('測試2);
};
}
https://stackoverflow.com/questions/16222895/uncaught-typeerror-cannot-set-property-onclick-of-null-onclick-not-working
https://stackoverflow.com/questions/14028959/why-does-jquery-or-a-dom-method-such-as-getelementbyid-not-find-the-element
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