//闭包两种情况 1:函数作为返回值 function fn() { var max =10; return function bar(x) { if(x > max){ console.log(x) }else{ console.log(666) } } } var f1=fn(),max = 100; f1(15) //15 //这里fn()赋给f1,调用f1时,即执行bar函数,此时x=15, //max的取值需是创建该函数的作用域内,即max=10;最后输出15.
//2:函数作为参数传递 var max=10, fn=function (x) { if(x > max){ console.log(x) }else{ console.log('000') } }; (function (f) { var max = 100; f(15) })(fn) //这是第二种情况,fn函数作为f参数,f(15)就是执行 fn(15); //此时x=15,max的取值应该是创建fn函数的作用域内取,即10,输出结果是15;
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