Comments (2)
var unboundBind = Function.prototype.bind
, bind = Function.prototype.call.bind(unboundBind);
请问为什么可以这样使用,这样使用有什么好处呢?
function bind3(func,context){
return func.bind(context);
}
bind 和 bind3 是等效的吗?
from underscore-analysis.
`Function.prototype.bind = Function.prototype.bind || function(context) {
var that = this;
return function() {
// console.log(arguments); // console [3,4] if ie<6-8>
return that.apply(context, arguments);
}
}`
这个在你es5 bind 那篇文章里的code 很confusing,其实真正的实现方法是
Function.prototype.bind = Function.prototype.bind || function(context){ var that = this; var args = Array.prototype.slice.call(arguments) return function(){ return that.apply(context, args.concat(Array.prototype.slice.call(arguments)); // that is function } }
from underscore-analysis.
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