void,eval和JavaScript中的Function构造函数有什么区别?
void(document.body.innerText += 'hi')
eval(document.body.innerText +='\nbye')
Function(document.body.innerText += '\n!!!')
void(Function(function foo(){document.body.innerText += '\n>hi2'; return true}).toString())();
eval(Function(function foo(){document.body.innerText += '\nbye2'; return true}).toString())();
Function(Function(function foo(){document.body.innerText += '\n!!!2'; return true}).toString())();
什么是这些不同的语句中执行代码的处理模式?
void(alert('hi'))
undefined
eval(alert('hi'))
undefined
Function(alert('hi'))
function anonymous() {
undefined
}
eval(Function(function foo(){return true}).toString())();
TypeError: undefined is not a function
void(Function(function foo(){return true}).toString())();
TypeError: string is not a function
Function(Function(function foo(){return true}).toString())();
undefined
void评估全局范围内的代码。 – 2012-08-31 15:20:48