Hoisting is JavaScript's default behavior of moving all declarations to the top of the current scope (to the top of the current script or the current function).
function number() {
return 1;
}
(function() {
try {
number();
} catch (ex) {
console.log(ex);
}
var number = function number() {
return 2;
};
console.log(number());
})();
console.log(number());
js会把声明提升到当前作用域的最上边，包括变量和函数声明。
function number() {
return 1;
}
(function() {
console.log(number());
function number() {
return 2;
}
})();
console.log(number());
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