我有这个对象:
var Settings = {
color: localStorage.color,
size : localStorage.size
};
我希望在更改后自动将新值保存到localStorage,这意味着我想要执行以下操作:
Settings.onchange = function(p){
localStorage[p] = this[p];
};
有可能吗?
PS:只需要Chrome支持。
答案 0 :(得分:2)
根据@RobG的评论,我写了这个函数,它有效!
function onPropertyChange(o, callback){
for(var p in o){
if(o.hasOwnProperty(p)){
var originalVal = o[p];
Object.defineProperty(o, p, {
get: function(){
return originalVal;
},
set: function(val){
callback.call(o, p, val);
return originalVal = val;
}
});
}
}
}
// example:
var Settings = {
color: localStorage.color || "red",
size : localStorage.size || "12px"
};
onPropertyChange(Settings, function(p, val){
localStorage[p] = val;
});