_$.prototype = {
each: function(fn){
for (var i = 0; i < this.elements.length; i++) {
fn.call(this, this.elements[i]); //第二個參數是fn函數的參數
}
},
setStyle: function(prop, val){
var that = this;
this.each(function(el){ //注意參數的設定
el.style[prop] = val;
});
return this;
}
}
window.$ = function(){
return new _$(arguments);
};
})();
window.onload = function(){
$("p", "p2").setStyle("color", "red");
}
</script>
</head>
<body>
<p id="p">
Hello world
</p>
<p id="p2">
Welcome.
</p>
</body>
</html>
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