JavaScript 面试题与答案

Test your skills through the online practice test: JavaScript Quiz Online Practice Test

问题 56. To set all checkboxes to true using JavaScript?

//select all input tags
function SelectAll() {
var checkboxes = document.getElementsByTagName("input");
for(i=0;i if(checkboxes.item(i).attributes["type"].value == "checkbox") {
checkboxes.item(i).checked = true;
}
}
}

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问题 57. What is === operator?

==== is strict equality operator ,it returns true only when the two operands are having the same value without any type conversion.

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问题 58. How to disable an HTML object?

document.getElementById("myObject").disabled = true;

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问题 59. To write messages to the screen without using "document.write()"?

Changing the contents of an element is a much better solution. When the method showStatus is invoked it will change the content of the span.
...
function showStatus(message) {
var element = document.getElementById("mystatus");
element.textContent = message; //for Firefox
element.innerHTML = message; //for IE (why can't we all just get along?)
return true;
}
...
<span id="mystatus">Test. </span>
...

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JavaScript 面试题与答案

相关差异对比

问题 56. To set all checkboxes to true using JavaScript?

问题 57. What is === operator?

问题 58. How to disable an HTML object?

问题 59. To write messages to the screen without using "document.write()"?

WithoutBook