js中创建函数的三种方式:
第一种(函数声明):
function sum1(num1,num2){
return num1+num2;
}
sum1(10,20);
第二种(函数表达式):
var sum2 = function(num1,num2){
return num1+num2;
}
sum(10,20);
第三种(函数对象方式):
var sum3 = new Function("num1","num2","return num1+num2");
//var 函数名 = new Function(“参数...”,”函数体”);
var sum = new Function("num1,num2","return num1+num2");
var result1 = sum(120,130);
alert(result1);