uncaught typeerror无法读取未定义Javascript的属性“0”

here is part of my function code that makes an error on javascript error console ( Google Chrome)

这是我的功能代码的一部分,在javascript错误控制台(谷歌浏览器)上出错

function premuto(x){
        if(x.Clickable){
                x.Selected = !x.Selected;
            if (x.Selected){
                x.style.backgroundColor ='lightblue';
                y = document.getElementById('spazio');
                y.innerHTML = y.innerHTML + x.innerHTML;
                sequenza[indice] = x.Number;
                indice++;
            }

error compares at line "sequenza[indice] = x.Number;"

错误比较在行“sequenza [indice] = x.Number;”

What's wrong?

Thanks

1 个解决方案

#1

Your indice is 0 and sequenza is undefined. In javascript it always raises a type error, if you try to reach undefined variable's properties or methods. You should debug your code and see exactly when sequanza becomes undefined.

你的indice是0并且sequenza是未定义的。在javascript中,如果您尝试访问未定义变量的属性或方法,它总是会引发类型错误。您应该调试代码并准确查看sequanza何时变为未定义。