javascript权威指南的一点总结
function compose(f,g){ return function(){ return f.call(this,g.apply(this,arguments)); };}var square=function(x){ return x*x;};var sum=function(x,y){return x+y;};var squareofsum=compose(square,sum);var result=squareofsum(2,3);console.log(result);//--------以上javascript权威南指的方法----------// ---下面综合运用xse:[1,2,3,4,5,6,7,8,9]----1*1+2*2+3*3+4*4+5*5+6*6+7*7+8*8+9*9--------var map=Array.prototype.map ?function(a,f){return a.map(f);} :function(a,f){//自定义map var results=[]; for(var i=0,len=a.length;i<len;i++){ if(i in a){ results[i]=f.call(this,a[i],i,a); } return results; }};var funsum=function(a,f){ var i=0,len=a.length,accumulator=0; while(i<len){ if(i in a) accumulator=f.call(undefined,accumulator,a[i],i,a); i++; } return accumulator;};var square=function(x){ return x*x;};var arrays=[1,2,3,4,5,6,7,8,9];var resultArrs=map(arrays,square);console.log(resultArrs);var sum=function(x,y){return x+y;};var sumofarrays=funsum(resultArrs,sum);console.log(sumofarrays);