正在加载...
正在加载...
ECStack = [];
ECStack = [
globalContext
];
(function foo(bar) {
if (bar) {
return;
}
foo(true);
})();
// 第一次foo的激活调用
ECStack = [
<foo> functionContext
globalContext
];
// foo的递归激活调用
ECStack = [
<foo> functionContext – recursively
<foo> functionContext
globalContext
];
eval('var x = 10');
(function foo() {
eval('var y = 20');
})();
alert(x); // 10
alert(y); // "y" 提示没有声明ECStack = [
globalContext
];
// eval('var x = 10');
ECStack.push(
evalContext,
callingContext: globalContext
);
// eval exited context
ECStack.pop();
// foo funciton call
ECStack.push(<foo> functionContext);
// eval('var y = 20');
ECStack.push(
evalContext,
callingContext: <foo> functionContext
);
// return from eval
ECStack.pop();
// return from foo
ECStack.pop();
function foo() {
var x = 1;
return function () { alert(x); };
};
var bar = foo();
bar(); // 1
eval('x = 2', bar); // 传入上下文，影响了内部的var x 变量
bar(); // 2