小技巧
//toString机制 function add(number1){ var sum = number1; var app = function(number2){ sum += number2; return app; }; app.toString = function(){ return sum; } return app; } alert(add(1)); // 1 console.log(add(1)(2)); // 3 console.log(add(1)(2)(3)); // 6 console.log(add(1)(2)(3)(4)); // 10
//柯里化函数 function sum(x){ function f(y){ return sum(x+y); } f.toString = f.valueOf = function(){ return x; }; return f; } sum(1)(2)(3) alert( (1) )
//不用循环打印 function print(str,number){ var arr = new Array( (number || 0) + 1 ); var str = arr.join(str); alert(str) } print("helloword ",10);