JS限制条件补全问题实例分析

var a=5;var b=6;a=a+b;b=a-b;a=a-b;alert(a);alert(b);

var n=5;function show(){  var arr=[];  return (function(){    arr.unshift(n);    n--;    if(n!=0){      arguments.callee();    }    return arr;  })();}alert(show(n));

var n=5;var arr=[];arr.length=n+1;var arr2=[];var str=arr.join("a"); //中间连接符用a，要六个数才五个逗号，所以length=n+1var re=/a/g;str.replace(re,function(){  arr2.unshift(n--);});alert(arr2);

var n=150;function show(){  return Math.min(n,100);}alert(show(n));

var n=50;function show(){  var arr=[n,100];  arr.sort();  return arr[0];}alert(show(n));

var n=150;function show(){  var str="n";  for(;str.length<3;){     return n;  }  for(;str.length>=3;){     return 100;  }}alert(show(n));

var n=50;function show(){  var json={};  var m=n<100||json; //m是布尔值  for(var attr in m){    return 100;  }  return n;}alert(show(n));