Javascript 使用变量调用javascript对象方法
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call javascript object method with a variable
提问by Achshar
i am new to object oriented javascript. I have a variable whose value i would like to use to call an object's method. like this..
我是面向对象的 javascript 的新手。我有一个变量，我想用它的值来调用对象的方法。像这样..
var foo = {
bar: function() {},
barr: function() {}
}
now there is a variable whose value can be any of the two method's names barand barri want to call them with something like
现在有一个变量，它的值可以是这两个方法的名称中的任何一个bar，barr我想用类似的东西来调用它们
var myvar = 'bar';
foo.{myVar}();
回答by pixelfreak
So I assume you want to call the appropriate function dynamically based on a string. You can do something like this:
所以我假设您想根据字符串动态调用适当的函数。你可以这样做：
var myVar = 'bar';
foo[myVar]();
Or you can also use evalbut this is riskier (prone to injection attack) and slower (don't do this!:P):
或者您也可以使用，eval但这风险更高（容易受到注入攻击）且速度更慢（不要这样做！：P）：
var myVar = 'bar';
eval('foo.' + myVar + '()');
回答by yan
Since you can access elements of an object via subscript notation, the following will do what you're looking for:
由于您可以通过下标符号访问对象的元素，因此以下内容将满足您的需求：
var myVar = 'bar';
foo[myVar]();
回答by Justin Ethier
You can just say:
你可以说：
foo[myVar]();
Since foois a JavaScript object, this code will reference the member by name contained in the myVarvariable.
由于foo是一个 JavaScript 对象，此代码将通过myVar变量中包含的名称引用该成员。
回答by wanovak
var foo = {
bar: function() { alert('bar'); },
barr: function() { alert('barr'); }
}
var myvar = 'bar';
foo[myvar](); // alert 'bar'
回答by Mrchief
Use something like: foo[myVar]();
使用类似的东西： foo[myVar]();
回答by John Hartsock
it should be something like this
它应该是这样的
foo[myvar]();
