javascript当中绑定事件和方法
8.绑定事件和方法 once, long time to know that "script" must be put in behind, while "input" must be put in front, otherwise document.getElementById("button1"); can not find the "button1"，alert("button1 is "+ button1); 结果就是null，为什么这次跟往常我们的印象不一样了呢？因为往常我们先写一段script，之后在body中写上诸如<INPUT TYPE="button" onclick="abc",之类的话，这样上面的abc这样的代码开始不会被执行，里面的诸如document.getElementById ("button1");也就正确了。这里为什么跟往常不一样呢？因为要在一开始时，先给button绑上事件代码，否则button无事件响应。 例 8.1（commonEventPrerequisiteIEFF.html） <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> </head> <INPUT TYPE="button" NAME="button1" ID="button1" VALUE="单击我"/> <script> function testie() { alert("单击按钮ie"); } function testFF() { alert("单击按钮FireFox"); } /**/ /*obj.addEventListener("click",function(){func("看到我了吧");},false); the third argument is: A Boolean flag value that indicates whether the event listener should use bubbling (由里向外) or capture (由外向里) event propagation. 只要我们 知道第三个参数和事件冒泡有关就可以了。缺省值为假，即冒泡的意思。具体例子参考后面的事件冒泡例子。 */ var button1 = window.document.getElementById("button1"); alert("button1 is "+ button1); alert("document.all is" + document.all); alert(typeof(window.addEventListener) + " is typeof window.addEventListener"); alert(typeof(window.attachEvent) + " is typeof window.attachEvent"); alert(window.addEventListener + " is window.addEventListener"); alert(window.attachEvent + " is window.attachEvent"); if (typeof window.attachEvent === "object") { alert("ie"); button1.attachEvent("onclick", testie); } if (typeof window.addEventListener === "function") { alert("firefox"); button1.addEventListener("click", testFF, false); } // button1.addEventListener("click",test,false); //button1.attachEvent("onclick" , test); var str = ""; </script> 更多请见：https://blog.csdn.net/qq_43650923/article/details/102210095
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