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3个使用this的典型应用
(1)、在html元素事件属性中使用,如:
<input type=”button” οnclick=”showInfo(this);” value=”点击一下”/>
(2)、构造函数
function Animal(name, color) {this.name = name;this.color = color; }
(3)、input点击,获取值
<input type="button" id="text" value="点击一下" /> <script type="text/javascript">var btn = document.getElementById("text");btn.onclick = function() {alert(this.value); //此处的this是按钮元素} </script>
(4)、apply()/call()求数组最值
var numbers = [5, 458 , 120 , -215 ]; var maxInNumbers = Math.max.apply(this, numbers); console.log(maxInNumbers); // 458 var maxInNumbers = Math.max.call(this,5, 458 , 120 , -215); console.log(maxInNumbers); // 458
转自:https://blog.csdn.net/wdlhao/article/details/79079660