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JavaScript：非输入框禁用退格键

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IP云V管理员/3 阅读
09/16
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在js文件或<javascript>标签中加入如下代码：

/**
*非输入框禁用退格键
*/
function banBackspace(e)
{
var ev = e || window.event;
var field = ev.target || ev.srcElement;
var fieldType = field.type || field.getAttribute('type');
var isReadOnly = field.readOnly;
var isDisabled = field.disabled;
isReadOnly = (isReadOnly == undefined) ? false : isReadOnly;
isDisabled = (isDisabled == undefined) ? true : isDisabled; var KEY_BACKSPACE = 8;
var inputFieldTypes = [ 'password', 'text' , 'textarea']; var isOnReadonlyOrDisabledField = inputFieldTypes.containsArr(fieldType) && (isReadOnly || isDisabled);
var isNotOnAnyField = !inputFieldTypes.containsArr(fieldType); if (ev.keyCode == KEY_BACKSPACE && (isOnReadonlyOrDisabledField || isNotOnAnyField)) {
return false ;
}
}
document.onkeydown = banBackspace;