I have a function myFun(param1, param2) {
//area1,...;}
When we call this function, we can call:
myFun(1,2);
myFun(1); --param1=1, param2 is undefined
myFun();--param1, param2 undefined
In the area1 place, we can add the sample code like
if(param1===undefined)
param1=0;
if(param2===undefined)
param2=1;
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