我想访问变量,例如。distance,vertex2Position,path在两个独立的函数中,内部的主函数称为getResult。我如何才能做到这一点,而不改变我的代码或以最小的方式改变我的代码。
function getResult() {
document.getElementById("vertex1").onchange = function() {
var vertex1 = document.getElementById("vertex1").value;
var vertex1Position = graph.node.findIndex(e => e.id == vertex1) + 1;
document.getElementById("output").textContent = vertex1Position;
var distance = execute(vertex1Position); // How can I access distance in my result variable
};
var vertex2Position = 0;
console.log("whats here");
document.getElementById("vertex2").onchange = function() {
var vertex2 = document.getElementById("vertex2").value;
vertex2Position = graph.node.findIndex(e => e.name == vertex2)+ 1; // I also want to access vertex2Position in my result variable which is in outer function
document.getElementById("secondOutput").textContent = vertex2Position;
var path = getPath(vertex2Position); //How can I access path in var result
};
var result = distance.vertex2Position; // I want to store distance and vertex2Position in result variable
document.getElementById("searchResult").innerHTML = "test" + result + "" + path + "."; // I also want to access path
}
发布于 2018-08-27 08:25:34
你应该使用类似这样的东西:
var container = (function(){
var distance;
var vertex2P;
return {
setDistance: function(distance){
this.distance = distance;
},
getDistance: function(){return this.distance;},
setVertex2P: function(vertex2P){
this.vertex2P = vertex2P;
},
getVertex2P: function(){return this.vertex2P;},
}}());
然后,您可以在其他函数中获取和设置值,如下所示
var result = function(){
container.setDistance(2);
container.setVertex2P(3);
console.log(container.getDistance() + container.getVertex2P());
}
result(); // 5
这些(也许)是你可以在Javascript中使用的最佳实践,你可以避免使用全局变量,并为你的变量增加隐私,希望它能对你有所帮助。
附言:您可以使用ECMASCRIPT 6来缩短这段代码
https://stackoverflow.com/questions/52029907
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