Uncaught TypeError：无法读取我的JavaScript文件中未定义的属性“ length”

Question

I am facing this console error while running my application:

Uncaught TypeError: Cannot read property 'length' of undefined

It is showing in my HYPE.js file at the following line:

for(;0<window.HYPE_100_DocumentsToLoad.length;)window.HYPE_100_DocumentsToLoad[0](),window.HYPE_100_DocumentsToLoad.splice(0,1);})();

Answer 1

The error happens because window.HYPE_100_DocumentsToLoad is undefined .

You should make sure it actually is an array before using it as such:

if (Array.isArray(window.HYPE_100_DocumentsToLoad)) {
    for(;0<window.HYPE_100_DocumentsToLoad.length;)window.HYPE_100_DocumentsToLoad[0](),window.HYPE_100_DocumentsToLoad.splice(0,1);})();
} else {
    throw new Error("Not an array, cannot loop over it");
}