试试这个函数(它可能不仅适用于 div):
function resized(elem, func = function(){}, args = []){
elem = jQuery(elem);
func = func.bind(elem);
var h = -1, w = -1;
setInterval(function(){
if (elem.height() != h || elem.width() != w){
h = elem.height();
w = elem.width();
func.apply(null, args);
}
}, 100);
}
你可以像这样使用它
resized(/*element*/ '.advs-columns-main > div > div', /*callback*/ function(a){
console.log(a);
console.log(this); //for accessing the jQuery element you passed
}, /*callback arguments in array*/ ['I\'m the first arg named "a"!']);
更新:
您还可以使用更先进的观察者(它可以用于任何对象,不仅是 DOM 元素):
function changed(elem, propsToBeChanged, func = function(){}, args = [], interval = 100){
func = func.bind(elem);
var currentVal = {call: {}, std: {}};
$.each(propsToBeChanged, (property, needCall)=>{
needCall = needCall ? 'call' : 'std';
currentVal[needCall][property] = new Boolean(); // is a minimal and unique value, its equivalent comparsion with each other will always return false
});
setInterval(function(){
$.each(propsToBeChanged, (property, needCall)=>{
try{
var currVal = needCall ? elem[property]() : elem[property];
} catch (e){ // elem[property] is not a function anymore
var currVal = elem[property];
needCall = false;
propsToBeChanged[property] = false;
}
needCall = needCall ? 'call' : 'std';
if (currVal !== currentVal[needCall][property]){
currentVal[needCall][property] = currVal;
func.apply(null, args);
}
});
}, interval);
}
去尝试一下:
var b = '2',
a = {foo: 'bar', ext: ()=>{return b}};
changed(a, {
// prop name || do eval like a function?
foo: false,
ext: true
}, ()=>{console.log('changed')})
每次直接更改 b、a.foo 或 a.ext 时,它都会记录 'changed'