在每个循环中jQuery这个

Question

initialize()函数内部有一个jQuery each循环.在该循环内部的引用this.dbcolumns显然不起作用,因为jQuery已重新分配this给当前循环元素.那么如何this.dbcolumns从循环内部引用呢？它在循环外工作正常.

function datatable() {
    this.url = '';
    this.htmltable = '';
    this.dbtable = '';
    this.dbcolumns = new Array();
    this.idfield = 'id';
    this.pageno = 0;
    this.pagesize = 15;
    this.totalpages = 0;
    this.totalrecords = 0;
    this.searchterm = '';

    this.initialize = function() {
        this.dbtable = $(this.htmltable).attr('data-table');
        this.dbcolumns.push(this.idfield);
        $(this.htmltable + ' th[data-field]').each(function(i, col){
            this.dbcolumns.push( $(col).attr('data-field') ); /* <<<<<<<<<< this line */
        });
        return this;
    }
} 

Answer 1

引用要保留在循环外部的"this".

var self = this;

然后你可以在循环中使用"self".