SOURCE

// Function.prototype.call2 = function(context){
//     context.fn = this
//     context.fn()
//     delete context.fn
// }
// var foo = {
//     val: 1234
// }
// function boor(name,age){
//     console.log(name)
//     console.log(age)
//     console.log(this.val)
// }
// // boor.call2(foo,'zhu','9')
// boor.call(foo,'zhu','9')

Function.prototype.call2 = function(context){
    context.fn = this
    var ags = []
    for(var i =1;i<arguments.length;i++){
        ags.push('arguments[' + i + ']')
    }
    eval('context.fn(' + ags +')')
    delete context.fn
}
var foo = {
    val: 1234
}
function boor(name,age){
    console.log(name)
    console.log(age)
    console.log(this.val)
}
// boor.call2(foo,'zhu','9')
boor.call2(foo,'zhu','9')