直接在函数声明中使用function.prototype.bind
问题描述:
为什么允许这样做?
var f = function() {
console.log(this.x);
}.bind({x:1})();
为什么这不是或更好为什么我在这种情况下会出现语法错误?
And why this is not or better why I get syntax error in this case ?
function f() {
console.log(this.x);
}.bind({x:1})();
那么,为什么我需要函数表达式语法来完成这项工作,有没有办法直接在函数声明上使用 bind
方法?
So, why I need function expression syntax to get this work and is there a way to use bind
method directly on function declaration ?
答
第二个例子有效,但语法稍微偏离:
The second example works but the syntax is slightly off:
将函数包含在parens中。我不得不说,我不完全确定为什么。似乎没有parens会工作吗? :P
Surround the function in parens. I have to say that I'm not entirely sure why. It seems like it would work without the parens huh? :P
(function f() {
console.log(this.x);
}).bind({x:1})();