文本框脚本

selectionStart 文本选取开头的偏移量

selectionEnd 文本选取结尾的偏移量

textbox.value.substring(textbox.selectionStart,textbox.selectionEnd)

setSelectionRange()

接收两个参数，开头和结尾的索引

IE8及更早版本

beforecopy:发生复制操作前触发

copy:复制操作

beforecut:发生剪切操作之前

cut:剪切操作时

beforepaste:发生粘贴操作之前

paste粘贴操作时

clipboardData对象

getData()

setData()

clearData()

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