Javascript 数组长度返回 0

Question

When I am using console.log to print the array length, it returns 0. But in the console, if I write txt.length it returns the actual length (ie 60 in my case). For this reason I can't iterate through the txt array.

var txt;

function preload() {
  txt = loadStrings("DataProcess/outData.txt");
  console.log(txt);
  console.log(txt.length);
}

Answer 1

You need to get the length in the callback. from the docs the function accepts 3 arguments

loadStrings(filename, [callback], [errorCallback])

meaning you should do something like this:

var txt;

function preload() {
  loadStrings("DataProcess/outData.txt", (res) => {
    txt = res
    console.log(txt.length);
  })

}