JS saves the method name according to the variable and executes the method example_javascript skills

Copy code The code is as follows:

function a(){
alert("fun a() ");
}
function b(){
alert("fun b()");
}
var methodName = "";
//method1
methodName = "a";
function method1(methodName){
//Initialize this.func property,
this.func = function(){};
try{
//Here Use the eval method to treat the method represented by the method name we passed in as an object and assign it to the func attribute of method1.
//If the corresponding object of methodName cannot be found, the eval method will throw an exception
this.func = eval(methodName);
}catch(e){
alert(methodName "( ) does not exist! ");
}
}
var c = new m(methodName);
c.func();

/**
* method2, relatively concise
*/
methodName = "b";
function method2(methodName){
this.func = new Function(methodName "();");
}
var c = new m(methodName );
try{
c.func();
}catch(e){
Ext.Msg.alert(methodName "() does not exist!");
}