1.普通版
if(Function.prototype.bind === undefined){
console.log('您的浏览器不支持bind方法，使用手写bind功能')
Function.prototype.bind = function(obj){
var arg1 = [].slice.call(arguments,1)
var fun = this
return function(){
fun.apply(obj,arg1.concat([].slice.call(arguments,1)))
}
}
}else{
console.log('您的浏览器支持bind方法')
}
2. MDN标准源码
if(!Function.prototype.bind) {
Function.prototype.bind = function(oThis) {
if(typeof this !== 'function') {
throw new TypeError('Error')
}
var args = Array.prototype.slice.call(arguments,1)
var fToBind = this
var fNOP = function(){}
var fBound = function() {
return fToBind.apply(this instanceof fNOP && oThis ? this : oThis || window,
args.concat(Array.prototype.slice.call(arguments)))
}
fNOP.prototype = this.prototype
fBound.prototype = new fNOP()
return fBound
}
}
————学习记录