一般写法
var caiyy function(){
//code
}var caiyy = () => {
//code
}带参数写法
var caiyy function(a,b){
//code
}var caiyy = (a,b) => {
//code
}var caiyy function(){
//code
}var caiyy = () => {
//code
}var caiyy function(a,b){
//code
}var caiyy = (a,b) => {
//code
}