The _Cross function in the global function column of the API documentation is used to calculate the cross-status of the two indicator lines
It should be noted that when arr1
is defined as an array of fast line indicators, and arr2
is defined as an array of slow line indicators,
the value returned by the _Cross
function is a positive number, that is, according to the context of documentation a positive number is the upswing period, a negative number indicates the downswing period, and 0 means it is the same as the current price
,
it can be seen that at this time, arr1
has up crossed arr2
for n cycles, namely the fast line up crossed the slow line, indicating golden cross.
Similarly, if the _Cross
function returns a negative number, it means death cross.
If ``arr1is defined as an array of slow line indicators, and
arr2as an array of fast line indicators, the situation will be opposite. If the value returned by the
_Crossfunction is a positive number, it means death cross. If the value returned by the
_Cross``` function is a negative number, it means golden cross.
// Return the number of upswing periods; a positive number represents the number of upswing periods, and a negative number represents the number of downswing periods, and 0 means it is the same as the current price
$.Cross = function(arr1, arr2) { // The number of parameters is 2. As you can see from the parameter names, these two parameters should be of array type.
// The array is like a line segment in the coordinate system where the X axis is the array index value and the Y axis is the index value. The function is to determine the intersection of two lines
if (arr1.length !== arr2.length) { // First, judge whether the lengths of the two compared arrays are equal
throw "array length not equal"; // If they are not equal, raise an error, for the unequal indicator lines cannot judge if crossed or not
}
var n = 0; // Declare the variable n to record the cross-status; its initial value is 0, indicating not crossed
for (var i = arr1.length-1; i >= 0; i--) { // Traverse arr1，from the last element to the front
if (typeof(arr1[i]) !== 'number' || typeof(arr2[i]) !== 'number') { // when arr1 or arr2 is non-numeric type (namely invalid indicators), break the traversing loop
break; // break the loop
}
if (arr1[i] < arr2[i]) { // If arr1 < arr2, the n-- will record the comparative status of arr1 and arr2 from the beginning (that is, at the beginning, n will adjust automatically according to the comparative value of arr1[i] and arr2[i]; once the comparison relation between arr1[i] and arr2[i] opposite to n happens, it means the two lines crossed).
if (n > 0) {
break;
}
n--;
} else if (arr1[i] > arr2[i]) { // If arr1 > arr2, then n++
if (n < 0) {
break;
}
n++;
} else { // arr1[i] == arr2[i], then break immediately
break;
}
}
return n; // Return n, indicating the number of periods with cross, 0 means equal indicator values
};
var arr1 = [1,2,3,4,5,6,8,8,9] // Fast line indicator
var arr2 = [2,3,4,5,6,7,7,7,7] // Slow line indicator
function main(){
Log("_Cross(arr1, arr2) : ", _Cross(arr1, arr2))
Log("_Cross(arr2, arr1) : ", _Cross(arr2, arr1))
}
You can see the results are 3 and -3.
The cross location is in front of three K-line bars.