How does uniApp call the method of the previous page

var pages = getCurrentPages(); // Current page
if (pages.length > 1) {  
    var beforePage = pages[pages.length - 2]; // The previous page
    beforePage.$vm.clear() //clear is the method you want to call the previous page, $vm is required
}
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Attention!!!!!

If (pages. Length > 1) {} if (pages. Length > 1) {