Question

怎么用js或者jquery监控一个变量改变后触发

Answer 1

用Object.defineProperty

    var data = {key:1};
    Object.defineProperty(data, "key", {
        set: function(value) {
            console.log(value)
        }
    });
    window.onload = function(){
        data.key = 2;
        data.key = 3;
    }