javascript - 在 EXTJS 中循环遍历数组时如何获取范围

Question

我有一个数组，我需要遍历它来获取一个值。

    someFunc: function(item) {
          var array = Ext.select(".item").elements;
          var elements;
          var itemId = item.id;
          Ext.each(array, function(ob){
            if (ob.id === itemId) {

              elements = ob.getElementsByTagName("input");
              Ext.each(elements, function(att){
                if (att.getAttribute("name") === "filter") {
                  console.log(att); 
                 this.callFunction();
    // here I want to call a function to do some stuff
    // but `"this"` here refers to input element
   //I should be able to call the function outside the someFunc, but I'm loosing scope
                    }

              });
            }


            });
        },

callFunctionL function() {

}

如何在遍历数组的数组时保持作用域？

Answer 1

有两种方式:

a) 将 scope 参数传递给每个:

Ext.each(o, function() {
    console.log(this);
}, this);

b) 在闭包中捕获作用域:

var self = this;
Ext.each(o, function() {
    console.log(self);
});