Implementation of the call. call the method. function cal () {} var obj = {} cal.call (obj, "sam", "kavin") change point, passing parameters
Function.prototype.call(context){
// If the object passed is null or empty when pointing window
var context = context || window
was args = []
// function call first to get the call, can be obtained with this
context.fn = this;
// We then put this array of arguments into the parameters of the function to be performed inside.
for(var i =1,len<arguments.length;i<len;i++){
args.push("arguments("+i+")")
}
var ret = eval("context.fn("+args+")")
delete context.fn
· return right
}
Implemented method of apply function cal () {} var obj = {} cal.call (obj, [ "sam", "kavin"]) to change the point, passing parameters
Function.prototype.apply2 = function(context,arr){
var context = context || window;
was res = ''
context.fn = this;
if(!arr){
res = context.fn()
}else{
was angry = []
for(var i =0,len=arr.length;i<len;i++){
arg.push("arr("+i+")")
}
res = eval（context.fn（+arg+））
}
delete context.fn
return res
}