Notes on sorting arrays (Array) in js_javascript skills

arrDemo[0] = 10;
arrDemo[1] = 50;
arrDemo[2] = 51;
arrDemo[3] = 100;

arrDemo.sort(); //After calling the sort method, the array itself will be changed, which affects the original array

alert(arrDemo);//10,100,50,51 By default, the sort method sorts by ascii alphabetical order, not by numerical order as we think

arrDemo.sort(function(a,b){return a>b?1:-1});//Sort from small to large

alert(arrDemo);//10,50,51,100

arrDemo.sort(function(a,b){return a

alert(arrDemo);//100,51,50,10